Revert "Revert "reflect moves from plone.app.widgets to plone.app.z3cform""

[jensens]

Reverts #287

2nd trial...

[mister-roboto]

@jensens thanks for creating this Pull Request and help improve Plone!

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass.

Whenever you feel that the pull request is ready to be tested, either start all jenkins jobs pull requests by yourself, or simply add a comment in this pull request stating:

@jenkins-plone-org please run jobs

With this simple comment all the jobs will be started automatically.

Happy hacking!

[jensens]

@jenkins-plone-org please run jobs

[pbauer]

@jensens Is this ready for merging together with plone/plone.app.vocabularies#56, plone/plone.app.z3cform#104 and plone/plone.app.widgets#194?

[jensens]

@pbauer for Plone 5.2, yes. Since p.a.dexterity is on master for Plone 5.1 this needs to be tested.

[jensens]

@pbauer last commit should do it, I start the tests now.