* gnome/Gnome.metadata: map properties for with_flags DateEdit ctor,
and hide the DateTime, bool, bool ctor
* gnome/Makefile.am: Add DateEdit.custom.
* gnome/DateEdit.custom: Add subclassable ctor for DateEdit and
add enough overloads that accept variable parameter lists to make
Mike Kestner sick.
svn path=/trunk/gtk-sharp/; revision=26961