Add some things about isomorphisms.

After    | File Name                             | Before
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0m40.10s | Category/Equality                     | 0m39.12s
0m22.13s | NaturalTransformation/Equality        | 0m21.97s
0m17.64s | Functor/Equality                      | 0m17.18s
0m10.88s | Comma/CommaCategory                   | 0m10.47s
0m10.74s | UniversalProperties                   | 0m10.60s
0m10.62s | Comma/Duals                           | 0m10.75s
0m09.19s | Groupoid                              | 0m09.32s
0m09.01s | Comma/InducedFunctors                 | 0m08.98s
0m07.88s | Category/Morphisms                    | 0m07.46s
0m04.74s | Grothendieck/ToSet                    | 0m04.90s
0m04.07s | Groupoid/Functors                     | 0m04.00s
0m02.55s | Groupoid/Duals                        | 0m02.58s
0m02.45s | SumPreCategory                        | 0m02.33s
0m02.28s | Functor/CompositionLaws               | 0m02.20s
0m02.12s | Category/Product                      | 0m02.22s
0m01.89s | NaturalTransformation/Duals           | 0m01.78s
0m01.63s | Hom                                   | 0m01.72s
0m01.34s | NaturalTransformation/Composition     | 0m01.46s
0m01.26s | NaturalTransformation/CompositionLaws | 0m01.22s
0m01.22s | InitialTerminalCategory               | 0m01.08s
0m01.02s | Comma/Projection                      | 0m01.00s
0m00.99s | Functor/Product                       | 0m01.01s
0m00.98s | NatCategory                           | 0m01.01s
0m00.94s | NaturalTransformation/Product         | 0m00.93s
0m00.72s | BoolCategory                          | 0m00.65s
0m00.55s | SetCategory                           | 0m00.50s
0m00.53s | Common                                | 0m00.53s
0m00.46s | Cat                                   | 0m00.42s
0m00.46s | Discrete/Duals                        | 0m00.48s
0m00.39s | FunctorCategory                       | 0m00.42s
0m00.32s | IndiscreteCategory                    | 0m00.30s
0m00.27s | NaturalTransformation/Identity        | 0m00.27s
0m00.27s | Adjoint/UnitCounit                    | 0m00.25s
0m00.25s | Category/Objects                      | 0m00.22s
0m00.25s | Functor/Composition                   | 0m00.27s
0m00.24s | NatCategory/Duals                     | 0m00.24s
0m00.23s | Functor/Duals                         | 0m00.26s
0m00.21s | IsGroupoid                            | 0m00.18s
0m00.21s | NaturalTransformation/Core            | 0m00.21s
0m00.17s | Category/Core                         | 0m00.19s
0m00.16s | Category/Duals                        | 0m00.15s
0m00.14s | NaturalNumbersObject                  | 0m00.12s
0m00.12s | ComputableCat                         | 0m00.14s
0m00.12s | Functor/Core                          | 0m00.13s
0m00.12s | Peano                                 | 0m00.12s
0m00.11s | Functor/Identity                      | 0m00.10s
0m00.10s | NaturalTransformation                 | 0m00.11s
0m00.10s | Category/Category                     | 0m00.10s
0m00.10s | Utf8                                  | 0m00.10s
0m00.09s | DiscreteCategory                      | 0m00.07s
0m00.09s | Grothendieck                          | 0m00.09s
0m00.08s | Functor                               | 0m00.10s
0m00.07s | Category/StrictCategory               | 0m00.09s
0m00.06s | NotationsUtf8                         | 0m00.07s
0m00.04s | Notations                             | 0m00.06s
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2m54.69s | Total                                 | 2m52.22s