Add a bunch of concatenation lemmas about isos

After    | File Name                             | Before
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0m15.79s | Category/Equality                     | 0m15.67s
0m09.90s | Comma/Duals                           | 0m09.82s
0m08.06s | Groupoid                              | 0m08.15s
0m07.61s | Comma/InducedFunctors                 | 0m07.51s
0m05.00s | Category/Morphisms                    | 0m02.13s
0m04.21s | Functor/Equality                      | 0m04.24s
0m04.11s | SumPreCategory                        | 0m04.07s
0m03.68s | Groupoid/Duals                        | 0m03.63s
0m03.54s | Groupoid/Functors                     | 0m03.30s
0m03.10s | UniversalProperties                   | 0m03.22s
0m02.52s | Grothendieck/ToSet                    | 0m02.58s
0m02.26s | Comma/CommaCategory                   | 0m02.32s
0m02.12s | BoolCategory                          | 0m02.06s
0m01.74s | NaturalTransformation/Equality        | 0m01.70s
0m01.70s | Category/Product                      | 0m01.68s
0m01.63s | NaturalTransformation/Duals           | 0m01.68s
0m01.57s | Hom                                   | 0m01.59s
0m01.28s | NaturalTransformation/Product         | 0m01.26s
0m01.21s | NaturalTransformation/Composition     | 0m01.25s
0m01.15s | Functor/Product                       | 0m01.21s
0m01.10s | NaturalTransformation/CompositionLaws | 0m01.13s
0m00.54s | InitialTerminalCategory               | 0m00.57s
0m00.45s | Functor/CompositionLaws               | 0m00.46s
0m00.42s | Common                                | 0m00.38s
0m00.36s | Comma/Projection                      | 0m00.40s
0m00.31s | Discrete/Duals                        | 0m00.32s
0m00.29s | FunctorCategory                       | 0m00.28s
0m00.29s | NaturalTransformation/Identity        | 0m00.26s
0m00.28s | IndiscreteCategory                    | 0m00.27s
0m00.28s | Cat                                   | 0m00.28s
0m00.28s | Adjoint/UnitCounit                    | 0m00.27s
0m00.27s | SetCategory                           | 0m00.32s
0m00.24s | NatCategory                           | 0m00.20s
0m00.24s | Functor/Composition                   | 0m00.25s
0m00.23s | Functor/Duals                         | 0m00.25s
0m00.21s | Category/Objects                      | 0m00.24s
0m00.20s | IsGroupoid                            | 0m00.22s
0m00.20s | NaturalTransformation/Core            | 0m00.19s
0m00.15s | NatCategory/Duals                     | 0m00.14s
0m00.14s | Category/Core                         | 0m00.20s
0m00.14s | NaturalNumbersObject                  | 0m00.16s
0m00.14s | Category/Duals                        | 0m00.13s
0m00.12s | Functor/Identity                      | 0m00.10s
0m00.12s | ComputableCat                         | 0m00.11s
0m00.12s | Functor/Core                          | 0m00.10s
0m00.12s | Peano                                 | 0m00.11s
0m00.11s | NaturalTransformation                 | 0m00.10s
0m00.11s | NaturalTransformation/Isomorphisms    | 0m00.08s
0m00.10s | Category/Category                     | 0m00.10s
0m00.10s | Functor                               | 0m00.07s
0m00.10s | DiscreteCategory                      | 0m00.10s
0m00.09s | Category/StrictCategory               | 0m00.08s
0m00.09s | Grothendieck                          | 0m00.11s
0m00.08s | Utf8                                  | 0m00.08s
0m00.05s | NotationsUtf8                         | 0m00.06s
0m00.05s | Notations                             | 0m00.05s
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1m30.29s | Total                                 | 1m27.23s