Prepartion for migration from GTK+ 2.x to GTK+ 3

[Stephen Fisher <steve () stephen-fisher com>]

The GTK+ documentation now includes a list of things we can do to 
prepare for the future migration to GTK+ 3:

  http://library.gnome.org/devel/gtk/unstable/gtk-migrating-2-to-3.html

I'm once again trying to compile with -DGSEAL_ENABLE to catch places 
where we're directly accessing variables, so they can be replaced with 
accessor functions.  The last time I tried this (quite a while back), 
they didn't have accessor functions for everything yet.

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