* generator/ReturnValue.cs : support owned and elements_owned for lists.
* glib/List.cs : add ctor overloads for memory mgmt.
* glib/ListBase.cs : add ctor overloads for memory mgmt. Dispose
elements if specified.
* glib/SList.cs : add ctor overloads for memory mgmt.
* gnome/Gnome.metadata : unhide and generate a List prop.
* gnomevfs/Gnomevfs.metadata : unhide and generate a List prop.
* gtk/FileChooser.custom : new. add hidden props.
* gtk/FileChooserButton.custom : new. impl hidden props.
* gtk/FileChooserDialog.custom : remove some List props and use the
GLib.Marshaller for the remaining ones..
* gtk/FileChooserWidget.custom : remove some List props and use the
GLib.Marshaller for the remaining ones..
* gtk/Gtk.metadata : unhide and let the generator do some List props.
svn path=/trunk/gtk-sharp/; revision=46457
