[gtkmm] Created tag 3.1.18

[Murray Cumming <murrayc src gnome org>]

The unsigned tag '3.1.18' was created.

Tagger: Murray Cumming <murrayc murrayc com>
Date: Tue Sep 6 11:32:47 2011 +0200

    3.1.18

Changes since the last tag '3.1.16':

Kjell Ahlstedt (1):
      Avoid infinite loop in Gtk::Dialog::get_content_area().

Murray Cumming (6):
      TreeView: Added unset_drag_dest_row().
      PrintUnixDialog::get_selected_printer(): ref-counting correction.
      Assistant: Added remove_page().
      Regenerated enum .defs files.
      Regenerated methods .defs and documentation .xml files.
      3.1.18