*Title: INI setting for top admin menu url's

*Incentive:
Make it possible to control various aspects of the
top menu in the admin interface as well as new entries.


*Documentation:
Each top menu entry now consists of:
- Name
    The name of the menu
    Note: Only the names bundled by eZ Publish are translatable
- Tooltip
    Some text which will be displayed in a tooltip
- URL
    Array of URLs which are used on the menu entry.
    The key in the array referes to the UI context (e.g edit),
    the default context must at least be defined
- NavigationPartIdentifier
    The navigation part identifier used by this entry.
    If the identifier of the curren module matches this
    one it will be highlighted.
- Enabled
    Controls if the menu can selected in the different
    UI contexts.
- Shown
    Controls which UI contexts the menu entry is shown.

To create a new entry just add it to menu.ini,
if you use an extension you must add it to menu.ini.append.

First you need to add an entry to the Tabs variable in the
TopAdminMenu group. This is a list of tab identifiers which
are currently in use.

Then you need to create a new INI group using the identifier
you just chose. e.g. If you named it custom you need to create
a group called Topmenu_custom.

In the group you must add the various elements defined above.