Namespace on gnome-menus library

[Mikael Hallendal <micke imendio com>]

Hi,

We should probably namespace gnome-menus. You currently include 
<menu-tree.h> and the functions are menu_tree_* for example. Would be 
better to have the functions namespaced so that it's easier to see where 
they come from.

#include <gnome-menus/menu-tree.h>

gnome_menu_tree_*

Best Regards,
  Mikael Hallendal

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