* glib/ManagedValue.cs, TypeConverter.cs: Added.
* glib/Value.cs: Make Value inherit from IDisposable, and
move dtor to Dispose. Add generic object constructor
with support for ManagedValue. Add a new Val property
which will call the appropriate explicit cast.
* glue/value.c: Add new glue function
gtksharp_value_get_value_type.
* gtk/TreeViewColumn.custom: Added.
* gtk/ListStore.custom, TreeStore.custom: Add a number
of SetValue overloads. Add convenience functtion
AppendValues. Add new ctor that takes System.Type instead
of GLib.TypeFundamentals. Add a GetValue convenience wrapper.
* gtk/TreeView.custom: Add AppendColumn convenience
functions.
* sample/ManagedTreeViewDemo.cs: Added.
* sample/Makefile.in: Update.
* sample/TreeViewDemo.cs: Update to use new convenience
APIs.
svn path=/trunk/gtk-sharp/; revision=14691
