Use maintainer mode in configure

This will automatically rebuild Makefile and configure if needed,
preventing problems like the missing targets in
https://github.com/HoTT/HoTT/pull/286#issuecomment-30749614.  This means
that we now depend on having autobuild around to run ./configure and
make, though I think that systems without them will simply get warnings,
and not errors.
Remove support for ssreflect

The ssreflect support has been inactive for a long time now. It would
take some effort to make it work, and it is unlikely this will happen.
So I am ripping it out. If in the future anyone wants to put it back
in, they can have a look at the history and go from there.
Remove further traces of ssreflect.
Add some more synonyms of [apD10_path_forall] for rewriting
Merge pull request #293 from JasonGross/ap10-path-forall

Add some more synonyms of [apD10_path_forall] for rewriting
Deopacify a bit in Functor/Pointwise/Properties

This is necessary to construct pointwise adjunctions.
Update a reference in a comment that was renamed

Closes #297.
Split off HoTTBookExercises.v from HoTTBook.v.

Since exercise formalizations tend to be a lot wordier than mere
backreferences to theorems in the library (as discussed in PR #302),
this patch splits HoTTBook.v into a separate exercises file, which
contains formalizations for the exercises in the HoTT book.  etc/Book.v
now takes a new flag, '--exercises', which instructs it to extract out
only exercises from the book; its default setting now no longer inserts
markers for exercises.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Merge pull request #303 from ezyang/split-exercises

Split off HoTTBookExercises.v from HoTTBook.v.
Add HoTTBookExercises.v to Makefile_targets.mk

This was forgotten in #303.
Merge pull request #292 from andrejbauer/master

Remove ssreflect "support" which isn't working anyhow.
Merge pull request #290 from JasonGross/enable-maintainer-mode

Use maintainer mode in configure
Move developer note to non-rendered section.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Solutions for 1.2-3, expand 1.1 solution.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Merge pull request #302 from ezyang/exercises

Solutions for 1.2-3, expand 1.1 solution.
Remove spaces
Squash a bunch of Matthieu's code improvements

From polyproj branch
Fix up some transparency issues

Opacity is respected by the kernel in polyproj Coq, and we really wanted
[simpl never] for most things, anyway.

After    | File Name                                                | Before
------------------------------------------------------------------------------
8m20.22s | Total                                                    | 8m18.24s
------------------------------------------------------------------------------
1m45.56s | categories/Comma/ProjectionFunctors                      | 1m44.65s
0m32.67s | categories/Adjoint/Composition/AssociativityLaw          | 0m32.79s
0m25.24s | categories/Grothendieck/PseudofunctorToCat               | 0m24.74s
0m17.10s | categories/ExponentialLaws/Law4/Functors                 | 0m17.80s
0m16.96s | categories/Adjoint/UnitCounitCoercions                   | 0m16.84s
0m16.31s | categories/Comma/InducedFunctors                         | 0m16.40s
0m16.10s | categories/FunctorCategory/Dual                          | 0m16.22s
0m13.00s | categories/Functor/Pointwise/Properties                  | 0m12.44s
0m12.99s | hit/Flattening                                           | 0m13.43s
0m12.79s | categories/Pseudofunctor/Core                            | 0m12.71s
0m12.16s | categories/Adjoint/Composition/Core                      | 0m11.84s
0m11.79s | categories/Adjoint/Dual                                  | 0m11.86s
0m11.70s | categories/Adjoint/Composition/IdentityLaws              | 0m11.10s
0m11.10s | categories/Pseudofunctor/FromFunctor                     | 0m10.29s
0m08.75s | categories/ExponentialLaws/Law1/Law                      | 0m08.24s
0m08.72s | categories/Functor/Prod/Universal                        | 0m08.55s
0m08.09s | categories/GroupoidCategory/Morphisms                    | 0m08.44s
0m07.42s | categories/UniversalProperties                           | 0m06.95s
0m07.07s | hit/Connectedness                                        | 0m07.37s
0m06.79s | categories/Comma/Dual                                    | 0m06.58s
0m06.36s | categories/Adjoint/Paths                                 | 0m06.38s
0m05.80s | categories/Adjoint/UnitCounit                            | 0m05.90s
0m05.78s | categories/Functor/Sum                                   | 0m05.67s
0m05.69s | categories/Functor/Paths                                 | 0m06.16s
0m05.64s | categories/Category/Morphisms                            | 0m05.89s
0m05.18s | EquivalenceVarieties                                     | 0m05.18s
0m04.88s | categories/ExponentialLaws/Law2/Functors                 | 0m05.05s
0m04.64s | categories/DualFunctor                                   | 0m05.46s
0m04.59s | categories/Category/Sigma/OnMorphisms                    | 0m04.16s
0m03.60s | categories/ProductLaws                                   | 0m03.66s
0m03.51s | types/ObjectClassifier                                   | 0m03.50s
0m03.28s | categories/Grothendieck/ToSet                            | 0m02.51s
0m03.11s | categories/Functor/Prod/Functorial                       | 0m02.88s
0m03.01s | types/Sigma                                              | 0m03.07s
0m02.78s | categories/Adjoint/UniversalMorphisms                    | 0m02.79s
0m02.62s | categories/FunctorCategory/Functorial                    | 0m02.70s
0m02.58s | Equivalences                                             | 0m02.62s
0m02.34s | categories/Functor/Attributes                            | 0m02.27s
0m02.19s | categories/Category/Sum                                  | 0m02.24s
0m02.10s | categories/Comma/Core                                    | 0m02.08s
0m02.06s | categories/Category/Sigma/Core                           | 0m02.04s
0m01.93s | categories/NaturalTransformation/Dual                    | 0m01.96s
0m01.89s | PathGroupoids                                            | 0m02.01s
0m01.84s | categories/HomFunctor                                    | 0m01.85s
0m01.79s | categories/NaturalTransformation/Isomorphisms            | 0m01.79s
0m01.67s | categories/NaturalTransformation/Paths                   | 0m01.60s
0m01.64s | categories/FunctorCategory/Morphisms                     | 0m01.71s
0m01.33s | categories/Category/Prod                                 | 0m01.31s
0m01.32s | categories/Category/Sigma/OnObjects                      | 0m01.34s
0m01.26s | categories/NaturalTransformation/Pointwise               | 0m01.31s
0m01.26s | types/Prod                                               | 0m01.30s
0m01.22s | categories/NaturalTransformation/Composition/Laws        | 0m01.25s
0m01.10s | categories/Limits/Core                                   | 0m01.23s
0m01.09s | categories/Functor/Pointwise                             | 0m01.05s
0m01.05s | categories/CategoryOfSections/Core                       | 0m01.05s
0m01.00s | categories/NaturalTransformation/Prod                    | 0m00.92s
0m00.98s | categories/ExponentialLaws/Law  N/A                      | 0m01.04s
0m00.96s | categories/ExponentialLaws/Law1/Functors                 | 0m00.98s
0m00.93s | hit/epi                                                  | 0m00.94s
0m00.93s | hit/Spheres                                              | 0m01.10s
0m00.92s | categories/Functor/Prod                                  | 0m00.95s
0m00.88s | categories/Functor/Composition/Functorial                | 0m00.84s
0m00.82s | types/Paths                                              | 0m00.79s
0m00.79s | Trunc                                                    | 0m00.84s
0m00.74s | categories/InitialTerminalCategory                       | 0m00.62s
0m00.68s | types/Universe                                           | 0m00.64s
0m00.66s | categories/NaturalTransformation/Composition/Core        | 0m00.64s
0m00.63s | types/Sum                                                | 0m00.59s
0m00.56s | hit/Circle                                               | 0m00.53s
0m00.56s | categories/Comma/Projection                              | 0m00.60s
0m00.54s | Functorish                                               | 0m00.62s
0m00.53s | categories/NaturalTransformation/Sum                     | 0m00.55s
0m00.53s | categories/Functor/Composition/Laws                      | 0m00.51s
0m00.52s | categories/categories                                    | 0m00.53s
0m00.52s | hit/quotient                                             | 0m00.54s
0m00.50s | hit/Suspension                                           | 0m00.53s
0m00.50s | types/Record                                             | 0m00.49s
0m00.45s | categories/Limits/Functors                               | 0m00.46s
0m00.44s | categories/KanExtensions/Functors                        | 0m00.41s
0m00.43s | HSet                                                     | 0m00.41s
0m00.43s | Tactics                                                  | 0m00.41s
0m00.43s | types/Forall                                             | 0m00.44s
0m00.41s | HProp                                                    | 0m00.44s
0m00.40s | categories/ExponentialLaws/Law3/Functors                 | 0m00.41s
0m00.39s | Fibrations                                               | 0m00.33s
0m00.38s | categories/Functor/Functor                               | 0m00.36s
0m00.37s | categories/Cat/Core                                      | 0m00.39s
0m00.36s | categories/NaturalTransformation/Identity                | 0m00.41s
0m00.33s | categories/IndiscreteCategory                            | 0m00.35s
0m00.32s | TruncType                                                | 0m00.39s
0m00.31s | categories/KanExtensions/Core                            | 0m00.26s
0m00.30s | categories/Functor/Dual                                  | 0m00.31s
0m00.29s | Misc                                                     | 0m00.28s
0m00.29s | categories/Cat/Morphisms                                 | 0m00.27s
0m00.28s | hit/minus1Trunc                                          | 0m00.36s
0m00.27s | categories/NaturalTransformation/Composition/Functorial  | 0m00.32s
0m00.26s | types/Arrow                                              | 0m00.27s
0m00.26s | categories/Grothendieck/Grothendieck                     | 0m00.22s
0m00.24s | categories/ExponentialLaws/ExponentialLaws               | 0m00.26s
0m00.24s | categories/Category/Objects                              | 0m00.23s
0m00.24s | categories/Notations                                     | 0m00.22s
0m00.22s | categories/NaturalTransformation/NaturalTransformation   | 0m00.20s
0m00.22s | categories/SetCategory/Functors/Functors                 | 0m00.24s
0m00.22s | categories/Functor/Composition/Core                      | 0m00.24s
0m00.22s | categories/Adjoint/Adjoint                               | 0m00.23s
0m00.21s | categories/Grothendieck/ToCat                            | 0m00.20s
0m00.20s | categories/Functor/Prod/Prod                             | 0m00.20s
0m00.20s | categories/Comma/Comma                                   | 0m00.18s
0m00.20s | categories/Utf8                                          | 0m00.22s
0m00.20s | categories/Pseudofunctor/Pseudofunctor                   | 0m00.17s
0m00.20s | categories/NaturalTransformation/Notations               | 0m00.16s
0m00.19s | categories/DependentProduct                              | 0m00.20s
0m00.19s | hit/iso                                                  | 0m00.20s
0m00.19s | categories/Category/Core                                 | 0m00.16s
0m00.19s | FunextVarieties                                          | 0m00.17s
0m00.18s | categories/FunctorCategory/FunctorCategory               | 0m00.21s
0m00.18s | categories/Profunctor/Representable                      | 0m00.16s
0m00.18s | categories/ExponentialLaws/Law1/Law1                     | 0m00.14s
0m00.17s | Conjugation                                              | 0m00.18s
0m00.17s | contrib/HoTTBook                                         | 0m00.16s
0m00.17s | categories/Category/Category                             | 0m00.16s
0m00.17s | categories/NatCategory                                   | 0m00.20s
0m00.17s | categories/ExponentialLaws/Law2/Law2                     | 0m00.16s
0m00.17s | categories/FunctorCategory/Core                          | 0m00.21s
0m00.16s | categories/Limits/Limits                                 | 0m00.16s
0m00.16s | HoTT                                                     | 0m00.15s
0m00.16s | categories/GroupoidCategory/Core                         | 0m00.18s
0m00.16s | categories/Adjoint/Composition/Composition               | 0m00.16s
0m00.15s | categories/Adjoint/Utf8                                  | 0m00.16s
0m00.15s | categories/KanExtensions/KanExtensions                   | 0m00.15s
0m00.15s | categories/SetCategory/Core                              | 0m00.12s
0m00.15s | categories/Category/Dual                                 | 0m00.16s
0m00.15s | categories/Adjoint/Identity                              | 0m00.13s
0m00.15s | hit/unique_choice                                        | 0m00.14s
0m00.15s | categories/Functor/Notations                             | 0m00.13s
0m00.15s | categories/Adjoint/Notations                             | 0m00.13s
0m00.15s | categories/Comma/Notations                               | 0m00.15s
0m00.15s | Overture                                                 | 0m00.14s
0m00.14s | categories/Comma/Utf8                                    | 0m00.16s
0m00.14s | categories/ExponentialLaws/Law3/Law3                     | 0m00.16s
0m00.14s | categories/Cat/Cat                                       | 0m00.16s
0m00.14s | categories/FunctorCategory/Utf8                          | 0m00.17s
0m00.14s | categories/Functor/Utf8                                  | 0m00.12s
0m00.14s | categories/Functor/Composition/Composition               | 0m00.11s
0m00.14s | categories/NaturalTransformation/Utf8                    | 0m00.16s
0m00.13s | categories/Adjoint/Core                                  | 0m00.13s
0m00.13s | categories/Profunctor/Notations                          | 0m00.12s
0m00.13s | categories/Profunctor/Identity                           | 0m00.12s
0m00.13s | categories/Functor/Pointwise/Pointwise                   | 0m00.10s
0m00.13s | categories/Adjoint/Composition/LawsTactic                | 0m00.14s
0m00.13s | categories/Profunctor/Utf8                               | 0m00.11s
0m00.12s | categories/Profunctor/Core                               | 0m00.09s
0m00.12s | categories/ExponentialLaws/Law4/Law4                     | 0m00.10s
0m00.12s | categories/Category/Univalent                            | 0m00.12s
0m00.12s | categories/Profunctor/Profunctor                         | 0m00.12s
0m00.12s | categories/NaturalTransformation/Core                    | 0m00.15s
0m00.12s | categories/Category/Subcategory/Subcategory              | 0m00.13s
0m00.12s | types/Unit                                               | 0m00.14s
0m00.12s | categories/Category/Sigma/Sigma                          | 0m00.12s
0m00.12s | hit/Truncations                                          | 0m00.14s
0m00.11s | categories/DiscreteCategory                              | 0m00.10s
0m00.11s | categories/GroupoidCategory/GroupoidCategory             | 0m00.08s
0m00.11s | hit/Interval                                             | 0m00.16s
0m00.11s | coq/Init/Peano                                           | 0m00.12s
0m00.11s | types/Bool                                               | 0m00.12s
0m00.11s | categories/SetCategory/SetCategory                       | 0m00.13s
0m00.11s | categories/NaturalTransformation/Composition/Composition | 0m00.11s
0m00.11s | categories/FunctorCategory/Notations                     | 0m00.12s
0m00.10s | categories/Category/Utf8                                 | 0m00.11s
0m00.10s | categories/Functor/Identity                              | 0m00.07s
0m00.10s | Contractible                                             | 0m00.11s
0m00.10s | categories/Category/Notations                            | 0m00.12s
0m00.10s | UnivalenceAxiom                                          | 0m00.10s
0m00.10s | categories/Category/Subcategory/Full                     | 0m00.11s
0m00.10s | categories/CategoryOfSections/CategoryOfSections         | 0m00.13s
0m00.09s | categories/Functor/Core                                  | 0m00.10s
0m00.09s | categories/Category/Subcategory/Wide                     | 0m00.13s
0m00.09s | contrib/HoTTBookExercises                                | 0m00.14s
0m00.08s | coq/Init/Specif                                          | 0m00.07s
0m00.08s | Pointed                                                  | 0m00.08s
0m00.07s | coq/Init/Datatypes                                       | 0m00.06s
0m00.07s | categories/Category/Strict                               | 0m00.07s
0m00.07s | types/Empty                                              | 0m00.08s
0m00.06s | coq/Init/Prelude                                         | 0m00.02s
0m00.06s | coq/Init/Logic_Type                                      | 0m00.06s
0m00.06s | FunextAxiom                                              | 0m00.08s
0m00.05s | coq/Init/Notations                                       | 0m00.03s
0m00.04s | coq/Init/Logic                                           | 0m00.02s
0m00.04s | coq/Bool/Bool                                            | 0m00.03s
0m00.04s | coq/Program/Tactics                                      | 0m00.07s
0m00.03s | coq/Init/Tactics                                         | 0m00.02s
Add some spaces to try to get coqdoc working

The preformatted output looks wrong.
Change case on pseduofunctor section name

Now the tags/links in the html files point to the right places.