Use two module templates to implement mods for all 10 integer types

[brson]

Uses the technique discussed in #2187 to reduce duplication

[brson]

This will probably make the documentation look odd, mentioning Ts instead of ints, etc. If #2176 is implemented we would be able to structure things so the docs would indicate that type T = int, and some of these little files to be eliminated.

[graydon]

clever, looks good to me.

[brson]

Merged. Thanks!