2010-01-05  Daniel Elstner  <daniel.kitta@gmail.com>

	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.