new panel menus implementation

[Mark McLoughlin <markmc redhat com>]

Hi,
	Just a heads up - I've imported a new module to CVS - "gnome-menus" -
which will contain the following:

  * libgnome-menu - an implementation[1] of the new menu spec[2]

  * .menu files which define how the menus are laid out

  * .directory files which used to be in gnome-desktop

  * gnome-test-menu-spec - a little test program used for testing the
    implementation against the test suite in freedesktop.org CVS.

	I've also committed a patch to make the panel use libgnome-menu rather
than the "vfolder" gnome-vfs module. I expect we'll be removing the
vfolder module from gnome-vfs fairly soon.

	One thing to note is that in order for your menus to work correctly
you'll now need to set $XDG_CONFIG_DIRS to $(prefix)/etc/xdg.

Cheers,
Mark.

[1] - heavily re-factored version of the code in desktop-file-utils
[1] - http://www.freedesktop.org/Standards/menu-spec