GNOME API freeze

I have spent the last week making last minutes additions and changes to the gtkmm API before the GNOME 2.9 API freeze, and now I can relax a bit.

Bryan Forbes has been very helpful, and Daniel Holbach found some missing stuff in the glibmm Option-parsing API. However, I think most gtkmm developers still don't understand that we have a schedule, so it's just me that worries about it.

Now for the rest of my list of tasks that built up during the past few months.