* changed project name from 'vlc' to 'VLC'
* excluded src/extras from the documentation
src/misc/variables.c, include/variables.h:
* Doxygen-documented most of the vlc variables code
* Extract documentation on static functions, useful to get the static
inline functions defined in header files listed. Drawback is that private
functions in source files are also listed.
documentation does not include information on which headers each file
includes, since this information isn't correct.
Clarified and doxygenized some of the documentation on subpictures
