Log Message:
update to 0.12.0
This is a major update, switches to the 0.12 release branch.
Most notable change is that the color management stuff which we had
as patches in pkgsrc is official now.
Otherwise - many fixes and enhancements.

(while this is a .0 release I've been tracking the 0.11.x snapshots
and release candidate for a while so I don't expect big problems)