[v3] doxygen markup for template parameters

[Benjamin De Kosnik]

In libstdc++/44015, there is a request for doxygen markup on template
parameters, including default arguments. This is a kind of markup that
libstdc++ has mostly not done, or done inconsistently.

So, here's how I think it should be done, at least for io and
containers. 

See generated files here:
http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/index.html

tested x86/linux

-benjamin
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