gladeui/glade-popup.c, gladeui/glade-project.c, gladeui/glade-signal-editor.c,
	gladeui/glade-widget-adaptor.c, src/glade-window.c, src/main.c:
	- Removed glade_app_get_editor(), Now the editor is not overly-refreshed by the
	  core and editors can be created at will, the core doesnt need to hold on to one.
	- Also, "gtk-doc-search" signal has been moved from the GladeEditor to the GladeApp.