In IRC over the weekend we discussed how the old themes seemed to
magically work with trunk, but that they were not guaranteed to continue
I changed the sidebar rendering for all of the themes in Proofread to
render_sidebars rather than the old way of doing things so that the
themes should continue working at least until the sidebar rendering
mechanism changes again. The changeset is available. 
All of the themes have been automatically tested, and everything seems
to still work. Exedge is broken, but it was broken before the update.
It makes a nice poster child for the test report features that were just
added to Proofread. 
Themes that work in trunk will now start to be tagged for 4.0, but I’m
calling it a night for now.