* configure.in, plugins/Makefile.am
	(new) plugins/class-inheritance/.cvsignore,
	(new) plugins/class-inheritance/Makefile.am,
	(new) plugins/class-inheritance/anjuta-class-inheritance.plugin.in,
	(new) plugins/class-inheritance/class-inherit.c,
	(new) plugins/class-inheritance/class-inherit.h,
	(new) plugins/class-inheritance/plugin.c,
	(new) plugins/class-inheritance/plugin.h,
	(new) plugins/class-inheritance/class-inheritance.png: Added class
	inheritance plugin.

	Changes by naba: Added pkgconfig check for graphviz and conditionally
	build graphviz.

	* plugins/patch/.cvsignore, plugins/tools/.cvsignore: Updated.