2010-01-05  Daniel Elstner  <[email protected]>

       Fine-tune Doxygen configuration to improve output

       * docs/reference/Doxyfile.in (SHOW_INCLUDE_FILES): Enable option, as
       it looks better than SHOW_USED_FILES and can be adjusted by means of
       the @headerfile command.
       (SHOW_USED_FILES): Disable.
       (ALPHABETICAL_INDEX): Enable alphabetical class index.
       (PREDEFINED): Predefine G_GNUC_INTERNAL in anticipation of explicit
       symbol visibility attributes.
       (CLASS_DIAGRAMS): Enable to get class inheritance graphs without any
       of the other graph options.
       (DOT_FONTNAME): Change to Sans to avoid the bad hinting for FreeSans
       at least on my system, which resulted in blurry graph labels.
       (COLLABORATION_GRAPH), (GROUP_GRAPHS), (TEMPLATE_RELATIONS): Disable
       additional graphs to reduce the noise.