remove level 2a from rotation

Also fix its noncontiguous program regions. It now has too many regions for the
a-f lettering that I have available, so that needs to be fixed before it can be
reinstituted (either add g or consolidate).

Generally I just have been very uncomfortable about this level, it is trickier
and more confusing than it needs to be, at least the back half.
improved 2a, back in the lineup
insert a new level 9 before the old one
a semi-trivial level 1a
Merge branch 'master' into gh-pages

Conflicts:
	levels.js
get the right levels