Skencil to use gtk 2.4 and libart2

[Bernhard Herzog]

Hi all,

from now on I'm going to use PyGTK 2.4 with GTK 2.4 and Python 2.3 for
Skencil development.  The reason is that with PyGTK 2.4 there are at
least some small incompatibilities with respect to older versions (see
e.g. Savannah patch #3844).  It's not really worth it to try and be
compatible with several PyGTK versions at this point in Skencil 0.7's
development.  I'll check in #3844 later today.  With the patch Skencil
won't run with older PyGTK versions any more.

Also, I'll use libart2 from now on.  I'll check in a corresponding
modification to setup.py later today.

   Bernhard

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