Add a buildout config for testing Plone 4.x
Removed ancient patch for CMFCore 1.4.7 or lower, which was last used
in Plone 2.0.5.
Properly get portal_discussion in the comments tests.

This may still fail on recent Plone versions because validate_talkback.vpy needs a fix,
similar to what David did in d228e858ede5a392dd2aa2008dffde900d01bc11 for our copy of discussion_reply.cpy.
Nuke trailing white space.
pyflakes
Remove tests/framework.py and tests/runalltests.py

That is ancient.
pyflakes and pep8 in the tests
pyflakes in content
more pyflakes