Update Doxygen configuration for Doxygen 1.6.1
Update Doxygen configuration for Doxygen 1.6.1

* doc/reference/Doxyfile.in: Update file using Doxygen 1.6.1.
(SORT_MEMBERS_CTORS_1ST): Set option to YES.

GNOME/librsvgmm,GNOME/librsvgmm,GNOME/librsvgmm