gtk-engines has been branched

[Thomas Wood <thos gnome org>]

The gtk-engines modules has been branched. The stable branch is now
gtk-engines-2-8 and jhbuild module sets have been updated.

Development will now start in head, and will require gtk+ 2.10. The
targets for the gtk-engines 2.10 release are to add gtk+ colour scheme
support to all the themes, and to polish the appearance of some of the
engines.

-Thomas