Add g_file_query_default_handler utility to easily look up the GAppInfo

Add g_file_query_default_handler utility to easily look up the GAppInfo

2008-01-29  Alexander Larsson  <alexl@redhat.com>

        * gfile.[ch]:
        Add g_file_query_default_handler utility to easily look up
	the GAppInfo that handles a file.

        * gdesktopappinfo.[ch]:
        * giomodule.c:
	Set up an extension point for g_app_info_get_default_for_uri_scheme()

        * gvfs.c:
	Remove unused function

svn path=/trunk/; revision=6409