This action is needed by the deimos prototype and is being implemented on
the deimos branch by the deimos team.

The action will add a pull-right menu to the File menu which lists recently
edited files. Files will be added to the list from several methods in
DataEditorSupport. The list is finite (currently hard-coded to 10). The
list is provided by org.openide.util.RecentFilesList (derived from a new
abstract class org.openide.util.LRUList). The action is provided by
org.openide.actions.RecentFilesAction.

The org.openide.util.RecentFilesValidator interface allows other classes
veto power over which edited files get added to the list. The expected use
for this veto would be debuggers which might not want every file stepped
into added to the list. Files explicitly opened should be added to the list
(no NetBeans classes have been modified to implement this interface, the
deimos team is using it with a closed source debugger).

One other note. The action is NOT being added to any NetBeans layer files.
The Deimos team has added it in a branding module.