[v3] regex doxygen markup

[Benjamin De Kosnik]

Adds in "base and implementation" subgroup for the main "regex" module.
This is similar to the unordered containers module, and the pb_ds
module. Any of the classes with complex hierarchies and implementation
strategies should have this, IMHO.

There were a couple of type-shortening changes, and a changing of
std::__regex to std::__detail for the implementation namespace, same as
the rest of libstdc++.

I'll regen the api html for the gcc website tomorrow. 

tested x86/linux

-benjamin
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