* src/glade-editor-property.[ch]: Added info buttons and
	  apis to enable/disable them + signals emitted to say what
	  doc book, page and searchstring should be used

	* src/glade-editor.[ch]: Same as glade-editor-property

	* src/glade-utils.c: Added functions for detecting and launching devhelp

	* src/glade-project-window.c: Check if we have devhelp installed; if we do
	  then show help buttons and launch devhelp upon "gtk-doc-search" signals

	* pixmaps/devhelp.png, pixmaps/Makefile.am: Added devhelp book icon

	* src/glade-app.c: Replace a gtk_widget_show_all with a gtk_widget_show
	  on the editor (to avoid needlessly showing hidden buttons).

	* src/glade-project.c: translated property nicks and blurbs.

	* src/glade-property-class.[ch]: Added 'virtual' member and resolve
	  it at initialization.

	* src/glade-widget-class.c: use g_build_filename instead of
	  g_strdup_printf for icon loading.
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