Move function gboolean sftpfs_show_error (GError ** error) to lib/vfs/utilvfs
and rename to gboolean vfs_show_gerror (GError ** error);

Signed-off-by: Slava Zanko <slavazanko@gmail.com>
UNDER CONSTRUCTION

Signed-off-by: Slava Zanko <slavazanko@gmail.com>