Add is_supported() to GNativeVolumeMonitorClass so that we can avoid

Add is_supported() to GNativeVolumeMonitorClass so that we can avoid

2007-12-17  Alexander Larsson  <alexl@redhat.com>

        * gnativevolumemonitor.h:
        * gunionvolumemonitor.c:
        * gunixvolumemonitor.c:
	Add is_supported() to GNativeVolumeMonitorClass so
	that we can avoid having to create an object to see
	if the backend is supported at runtime.
	Also add name member and an env var to pick a specific
	volume monitor backend.

        * gmountprivate.h:
        * glocalfile.c:
	Add cancellable to _g_mount_get_for_mount_path()

        * glocaldirectorymonitor.c:
        * glocalfilemonitor.c:
	Avoid loading and unloading modules while sorting.

svn path=/trunk/; revision=6144