* gladeui/glade-catalog.c: Loop through user defined search paths and load
	  catalogs from there first.

	* gladeui/glade-utils.c: Loop through user defined search paths for modules,
	  then fallback on the compile time default, then fallback on default system
	  library paths.

	* gladeui/glade-app.h: Define env variables GLADE_MODULE_PATH & GLADE_CATALOG_PATH


svn path=/trunk/; revision=1516