Now we have a conversion routine that is run in the plugin to
	convert some data for one format to another (builder on the way...)
	In this patch we use it to handle GtkAdjustment property conversions.
	(NOTE: Completely undoable)
	
	* gladeui/glade-editor-property.c: Made adjustment eprop fallback on
	  object dialog in builder cases.

	* gladeui/glade-command.[ch]: Added glade_command_set_project_format()

	* gladeui/gldae-catalog.c, gladeui/glade-xml-utils.h: Added GladeProjectConvertFunc

	* plugins/gtk+/Makefile.am, plugins/gtk+/glade-convert.c,
	plugins/gtk+/gtk+.xml.in: New file to handle conversion routines, 
	added some objects.


svn path=/trunk/; revision=1935