[Expanded from patch by John Luke attached to bug.]
* gdk/Gdk.metadata : rename Atom.Name to GetName so it props.
* gdk/Atom.custom : new string cast operator.
* sample/TestDnd.cs : fix Atom.Name reference
* sample/GtkDemo/DemoEditableCell.cs : fix a ListStore.Remove
ref broken by last commit.
[Fixes#57721]
svn path=/trunk/gtk-sharp/; revision=26208