Remove useless assumptions from isomorphism lemmas

After    | File Name                             | Before
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0m17.56s | Category/Equality                     | 0m16.87s
0m10.00s | Comma/Duals                           | 0m10.38s
0m08.87s | Groupoid                              | 0m08.85s
0m07.76s | Comma/InducedFunctors                 | 0m07.75s
0m04.80s | Category/Morphisms                    | 0m04.91s
0m04.64s | SumPreCategory                        | 0m04.74s
0m04.51s | Functor/Equality                      | 0m04.43s
0m03.91s | Groupoid/Duals                        | 0m03.85s
0m03.67s | Groupoid/Functors                     | 0m03.61s
0m03.34s | UniversalProperties                   | 0m03.18s
0m02.68s | Grothendieck/ToSet                    | 0m02.87s
0m02.36s | BoolCategory                          | 0m02.33s
0m02.36s | Comma/CommaCategory                   | 0m02.39s
0m01.86s | NaturalTransformation/Equality        | 0m01.88s
0m01.82s | Category/Product                      | 0m01.83s
0m01.73s | Hom                                   | 0m01.79s
0m01.71s | NaturalTransformation/Duals           | 0m01.74s
0m01.46s | NaturalTransformation/Composition     | 0m01.36s
0m01.27s | NaturalTransformation/Product         | 0m01.36s
0m01.25s | NaturalTransformation/CompositionLaws | 0m01.15s
0m01.24s | Functor/Product                       | 0m01.26s
0m00.56s | InitialTerminalCategory               | 0m00.59s
0m00.43s | Functor/CompositionLaws               | 0m00.48s
0m00.39s | Comma/Projection                      | 0m00.42s
0m00.39s | Common                                | 0m00.43s
0m00.33s | Discrete/Duals                        | 0m00.29s
0m00.30s | SetCategory                           | 0m00.28s
0m00.29s | IndiscreteCategory                    | 0m00.33s
0m00.28s | FunctorCategory                       | 0m00.25s
0m00.28s | NaturalTransformation/Identity        | 0m00.30s
0m00.27s | Cat                                   | 0m00.26s
0m00.26s | Category/Objects                      | 0m00.22s
0m00.26s | Functor/Duals                         | 0m00.25s
0m00.26s | Functor/Composition                   | 0m00.24s
0m00.24s | NatCategory                           | 0m00.21s
0m00.22s | IsGroupoid                            | 0m00.17s
0m00.21s | Adjoint/UnitCounit                    | 0m00.28s
0m00.21s | NaturalTransformation/Core            | 0m00.22s
0m00.18s | Category/Core                         | 0m00.17s
0m00.16s | NaturalNumbersObject                  | 0m00.17s
0m00.14s | NatCategory/Duals                     | 0m00.14s
0m00.13s | ComputableCat                         | 0m00.16s
0m00.12s | NaturalTransformation                 | 0m00.11s
0m00.12s | NaturalTransformation/Isomorphisms    | 0m00.12s
0m00.12s | Functor/Core                          | 0m00.13s
0m00.11s | Functor/Identity                      | 0m00.12s
0m00.11s | Functor                               | 0m00.08s
0m00.11s | Category/Duals                        | 0m00.14s
0m00.10s | Category/Category                     | 0m00.11s
0m00.10s | DiscreteCategory                      | 0m00.10s
0m00.10s | Peano                                 | 0m00.10s
0m00.10s | Grothendieck                          | 0m00.12s
0m00.08s | Utf8                                  | 0m00.10s
0m00.07s | Category/StrictCategory               | 0m00.10s
0m00.04s | NotationsUtf8                         | 0m00.04s
0m00.04s | Notations                             | 0m00.06s
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1m35.90s | Total                                 | 1m35.81s
Add classification of natural isomorphisms

Also update notation a bit

After    | File Name                             | Before
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0m17.68s | Category/Equality                     | 0m18.14s
0m10.87s | Comma/Duals                           | 0m11.11s
0m09.66s | Groupoid                              | 0m09.64s
0m08.19s | Comma/InducedFunctors                 | 0m08.98s
0m05.32s | Category/Morphisms                    | 0m05.29s
0m05.06s | SumPreCategory                        | 0m04.99s
0m04.67s | Functor/Equality                      | 0m04.51s
0m04.18s | Groupoid/Duals                        | 0m04.19s
0m03.85s | Groupoid/Functors                     | 0m03.68s
0m03.40s | UniversalProperties                   | 0m03.57s
0m02.98s | Grothendieck/ToSet                    | 0m03.04s
0m02.52s | BoolCategory                          | 0m02.76s
0m02.50s | Comma/CommaCategory                   | 0m02.60s
0m02.18s | NaturalTransformation/Equality        | 0m02.18s
0m02.02s | NaturalTransformation/Duals           | 0m02.09s
0m01.88s | Category/Product                      | 0m01.90s
0m01.72s | Hom                                   | 0m01.74s
0m01.55s | NaturalTransformation/Composition     | 0m01.60s
0m01.45s | NaturalTransformation/Product         | 0m01.43s
0m01.41s | Functor/Product                       | 0m01.36s
0m01.33s | NaturalTransformation/CompositionLaws | 0m01.23s
0m00.94s | FunctorCategory/Morphisms             |   N/A
0m00.64s | InitialTerminalCategory               | 0m00.68s
0m00.52s | Functor/CompositionLaws               | 0m00.46s
0m00.45s | Common                                | 0m00.49s
0m00.40s | Comma/Projection                      | 0m00.42s
0m00.36s | SetCategory                           | 0m00.31s
0m00.35s | Discrete/Duals                        | 0m00.33s
0m00.34s | IndiscreteCategory                    | 0m00.35s
0m00.33s | FunctorCategory                       | 0m00.32s
0m00.29s | Cat                                   | 0m00.32s
0m00.29s | Adjoint/UnitCounit                    | 0m00.30s
0m00.29s | NaturalTransformation/Identity        | 0m00.32s
0m00.28s | Functor/Composition                   | 0m00.24s
0m00.27s | Category/Objects                      | 0m00.22s
0m00.25s | NatCategory                           | 0m00.26s
0m00.24s | Functor/Duals                         | 0m00.31s
0m00.23s | NaturalTransformation/Core            | 0m00.18s
0m00.20s | IsGroupoid                            | 0m00.23s
0m00.18s | NaturalNumbersObject                  | 0m00.18s
0m00.17s | ComputableCat                         | 0m00.21s
0m00.16s | Category/Core                         | 0m00.19s
0m00.16s | NatCategory/Duals                     | 0m00.18s
0m00.16s | Category/Duals                        | 0m00.20s
0m00.15s | Peano                                 | 0m00.15s
0m00.13s | NaturalTransformation/Isomorphisms    | 0m00.14s
0m00.13s | Functor                               | 0m00.12s
0m00.13s | Functor/Core                          | 0m00.14s
0m00.11s | NaturalTransformation                 | 0m00.13s
0m00.11s | Category/StrictCategory               | 0m00.09s
0m00.11s | Utf8                                  | 0m00.09s
0m00.11s | Grothendieck                          | 0m00.11s
0m00.10s | Functor/Identity                      | 0m00.10s
0m00.10s | Category/Category                     | 0m00.11s
0m00.10s | DiscreteCategory                      | 0m00.11s
0m00.05s | NotationsUtf8                         | 0m00.06s
0m00.05s | Notations                             | 0m00.06s
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1m43.29s | Total                                 | 1m44.14s