Allow making backend modules resident. This is needed only for some

Allow making backend modules resident. This is needed only for some

2008-03-03  Carlos Garcia Campos  <carlosgc@gnome.org>

	* backend/pdf/pdfdocument.evince-backend.in:
	* libdocument/ev-backends-manager.c:
	(ev_backends_manager_load_backend),
	(ev_backends_manager_get_document):
	* libdocument/ev-module.[ch]: (ev_module_load), (ev_module_new):

	Allow making backend modules resident. This is needed only for
	some backends like pdf to avoid registering glib types more than
	once.

svn path=/trunk/; revision=2943