Updates to the "latest" doxygen and changes in style of generated
pages to more explicit qualification. More coherent namespace
documentation. Some of the css formatting for the class member
documentation seems off, which is next on the to-do list.

Newer graphviz has improved (cairo) output.

As here:
http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen

tested x86/linux

-benjamin