Include Dexterity pinning for Plone 4.1

This makes easier to test Dexterity based packages on Plone 4.1; most of the pinning was taken from Plone 4.2 versions.cfg file but some version were bumped up to newer bug fix release.

See: http://plone.293351.n2.nabble.com/including-Dexterity-pinning-in-buildout-plonetest-for-Plone-4-1-td7568363.html