Beef up some product notations

I'm not terribly happy with needing so much redundancy, and have sent an
email to coq-club asking about better ways to do "only printing"
notations, but have not gotten anything back yet.

After    | File Name                             | Before
-----------------------------------------------------------
1m32.16s | Adjoint/Hom                           | 1m31.90s
0m18.41s | Category/Equality                     | 0m18.83s
0m09.88s | Comma/Duals                           | 0m09.86s
0m07.70s | Comma/InducedFunctors                 | 0m07.88s
0m06.60s | Groupoid                              | 0m06.42s
0m05.24s | Category/Morphisms                    | 0m05.26s
0m04.16s | SumPreCategory                        | 0m04.22s
0m04.00s | Groupoid/Duals                        | 0m04.02s
0m04.00s | Functor/Equality                      | 0m04.00s
0m03.61s | Groupoid/Functors                     | 0m03.34s
0m03.12s | UniversalProperties                   | 0m03.15s
0m02.51s | Grothendieck/ToSet                    | 0m02.57s
0m02.34s | Comma/CommaCategory                   | 0m02.38s
0m02.14s | BoolCategory                          | 0m02.08s
0m01.78s | NaturalTransformation/Equality        | 0m01.73s
0m01.71s | Category/Product                      | 0m01.69s
0m01.66s | NaturalTransformation/Duals           | 0m01.69s
0m01.58s | Hom                                   | 0m01.50s
0m01.28s | NaturalTransformation/Product         | 0m01.26s
0m01.24s | NaturalTransformation/Composition     | 0m01.24s
0m01.17s | NaturalTransformation/CompositionLaws | 0m01.14s
0m01.15s | Functor/Product                       | 0m01.22s
0m01.06s | NaturalTransformation/Isomorphisms    | 0m01.03s
0m00.97s | FunctorCategory/Morphisms             | 0m00.93s
0m00.79s | Cat/Morphisms                         | 0m00.71s
0m00.57s | InitialTerminalCategory               | 0m00.55s
0m00.46s | Functor/CompositionLaws               | 0m00.46s
0m00.42s | Comma/Projection                      | 0m00.42s
0m00.35s | Discrete/Duals                        | 0m00.32s
0m00.33s | Common                                | 0m00.34s
0m00.32s | IndiscreteCategory                    | 0m00.29s
0m00.29s | Adjoint/UnitCounit                    | 0m00.28s
0m00.28s | Cat                                   | 0m00.30s
0m00.28s | FunctorCategory                       | 0m00.25s
0m00.28s | NaturalTransformation/Identity        | 0m00.26s
0m00.27s | SetCategory                           | 0m00.29s
0m00.24s | Category/Objects                      | 0m00.22s
0m00.22s | NatCategory                           | 0m00.24s
0m00.22s | Functor/Composition                   | 0m00.24s
0m00.21s | Functor/Duals                         | 0m00.21s
0m00.20s | IsGroupoid                            | 0m00.19s
0m00.17s | Category/Core                         | 0m00.19s
0m00.15s | Adjoint                               | 0m00.17s
0m00.15s | NaturalNumbersObject                  | 0m00.15s
0m00.15s | Category/Duals                        | 0m00.12s
0m00.15s | NaturalTransformation/Core            | 0m00.17s
0m00.14s | NatCategory/Duals                     | 0m00.15s
0m00.14s | ComputableCat                         | 0m00.14s
0m00.12s | NaturalTransformation                 | 0m00.11s
0m00.12s | Peano                                 | 0m00.12s
0m00.10s | Functor/Core                          | 0m00.12s
0m00.10s | Category/UnivalentCategory            | 0m00.10s
0m00.09s | Functor                               | 0m00.09s
0m00.09s | Utf8                                  | 0m00.10s
0m00.09s | DiscreteCategory                      | 0m00.08s
0m00.08s | Category                              | 0m00.09s
0m00.08s | Category/StrictCategory               | 0m00.08s
0m00.08s | Grothendieck                          | 0m00.09s
0m00.07s | Functor/Identity                      | 0m00.06s
0m00.06s | Notations                             | 0m00.05s
0m00.05s | NotationsUtf8                         | 0m00.06s
-----------------------------------------------------------
3m07.38s | Total                                 | 3m07.15s