* gtk/NodeSelection.cs: use new Adapter prop on NodeStore.
* gtk/NodeStore.cs: some encapsulation rework.
* gtk/NodeView.cs: use new Adapter prop on NodeStore. new methods
to support manipulation of the view by TreeNode, like scrolling
and cell bounds lookups.
* gtk/TreeView.cs: use new Adapter prop on NodeStore.
* doc/en/Gtk/NodeView.xml: new doc updates.
Patch provided by Vladimir Giszpenc. [Fixes#480067]
svn path=/trunk/gtk-sharp/; revision=129498
