2006-07-08  Jürg Billeter  <j@bitron.ch>

	* vala/valasemanticanalyzer.vala: check method signatures of overriding
	  methods
	* vala/parser.y, vala/valaclassregisterfunction.vala,
	  vala/valatyperegisterfunction.vala: support abstract classes
	* vala/valamethod.vala: add equals method
	* vala/valatypereference.vala: add equals method
	* corrects overriding methods to match signatures of overridden methods
	  to fix build with current compiler

svn path=/trunk/; revision=73