[v3] doxygen group markup

[Benjamin Kosnik]

Adjusts some group markup in doxygen. Current status is here:
http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/modules.html

Added:
 - Locales group.
 - basic_streambuf, extension streambufs
 - pb_ds and vstring in groups
 - updates for Function Objects for C++0x.

There's a bit of inconsistency WRT documenting extensions. For
diagnostics, io, and allocators, the extension and standard components
are all mixed together. For containers and algos that is really not the
case. It might make more sense to just kill the extension grouping and
fold the rest of this stuff in to the other groups.

Anyway. 

With this, there is coverage for sections 3-11 of the manual. (Plus
extras.) It's mighty tempting to try and fold the group parts of the
doxygen output (in either html or xml) into this area of the docbook
manual. I don't believe I will get to that right now though it would be
a sweet trick.

tested x86_64/linux

-benjamin
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