Resolved collective.z3cform.datagridfield version confusion

While migration of a Plone 4.3.18 site with to our docker environment, I found collective.z3cform.datagridfield in a confusing state.

Now it is fixed. If you use it in Plone 4.3 use fresh released version 1.3.1.
Otherwise for Plone 5 there is a fresh version 1.4.0 released.
I hope all is fine with those...

Plone 5.2/Python 3 changes are still pending in PR 79. A rebase is needed, more work too and tests should go green.

Help appreciated! This is probably a low hanging fruit for the Plone Tagung Sprint. Any takers?

I rebased the python3 branch and pushed to the repo