Fixed broken resource pool & wrote some doc. Now save the "<required
* src/glade-project.c: Fixed broken resource pool & wrote some doc. Now save the "<required lib="..."/> catalog requirements to the glade file and complain when loading glade files that demand unavailable catalogs. * src/glade-widget-class.[ch]: Added widget_class->catalog * src/glade-catalog.[ch]: Added glade_catalog_is_loaded (), call gwc_new with catname arg. * src/glade-parser.c: Added glade_util_ui_message error messaging when having errors loading glade files. * src/glade-project-window.c: Removed redundant error message.
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