rename base_types of interfaces to prerequisites to follow GObject

rename base_types of interfaces to prerequisites to follow GObject

2007-03-04  Jürg Billeter  <j@bitron.ch>

	* vala/parser.y, vala/valainterface.vala,
	  vala/valasemanticanalyzer.vala: rename base_types of interfaces to
	  prerequisites to follow GObject terminology
	* vala/valamethod.vala, vala/valasemanticanalyzer.vala,
	  vala/valacodegenerator.vala: move interface usage part from
	  base_method to base_interface_method property
	* vala/valasemanticanalyzer.vala: don't require interface
	  implementations to specify override
	* vala/valacodegenerator.vala: support base access in interface
	  implementations
	* tests/test-017.vala: remove override in method declaration

svn path=/trunk/; revision=218