add cheader filename logic usable for all Vala.Member types. parse

add cheader filename logic usable for all Vala.Member types. parse

2007-07-22  Raffaele Sandrini  <raffaele@sandrini.ch>

	* vala/valamember.vala: add cheader filename logic usable for all
	  Vala.Member types.
	* vala/valamethod.vala: parse cheader_filename CCode attribute
	  argument
	* vala/valadatatype.vala: fix get_cheader_filenames method signature
	  to override the Symbol method instead of defining a new virtual
	  method
	* vala/valasourcefile.vala: adopt add_symbol_dependency to use the fact
	  all Vala.Symbol types maintain their list of headers

svn path=/trunk/; revision=371