[cairo] Re: device offsets handling and push/pop group support patches

[Vladimir Vukicevic]

Updated patches; device x/y scale are now handled, so the PS surface
is happy now with non-72dpi resolutions.  However, the PS surface is
still not happy with device offsets -- I haven't yet tried to follow
through the meta surface/image surface/etc., and may need some help in
doing so.  push_group/pop_group are thus broken for ps surfaces.

Also adds some clip re-creation code if the clip type doesn't match
for the intermediate surface.

   - Vlad
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