Add g_unix_mount_guess_should_display and use for unix volume monitor

Add g_unix_mount_guess_should_display and use for unix volume monitor

2008-01-09  Alexander Larsson  <alexl@redhat.com>

        * gio.symbols:
        * gunixmount.c:
        * gunixmounts.[ch]:
	Add g_unix_mount_guess_should_display and use
	for unix volume monitor backend.
	This means we more or less show what the
	gnome-vfs backend did.
	Based on patch from Padraig O'Briain

svn path=/trunk/; revision=6285