[v3] doxygen tweaks

[Benjamin Kosnik]

This is a documentation patch. It adds brief documents for some locale classes and functions, cleans up generated io types, and attempts to sort out the inheritance diagrams a bit for ctype/codecvt.

I tried to figure out a way to get
unary_function/binary_function/iterator partial specializations to
appear in some kind of sorted order in the class inheritance graph,
(partial to full) but failed. For some reason, if doxygen is configured
to graph undocumented classes, the generated class hierarchies for the
documented classes are better. 

Agh. 

tested x86/linux

-benjamin
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