Pmr2.z3cform

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* Using the view directly should work for both plone.protect 2 and 3
within the unittesting environment.
* Ensure the local test cases here work with fixes introduced by
Products.PloneHotfix20160830.
* Update the keyring support to deal with anonymous test users to permit
following of the same logic.

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* Support for the form specific keyring introduced by plone.protect>3
and plone.keyring>3; fallback is also supported.

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* Packaging fixes; this is done for wording and cleaner generic setup
integration.

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* Now provide the customized ploneform macros, migrated in from the
pmr2.app module.
* Making use of bootstrap classes
* Removed deprecated zope.app.* imports.

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* Initial release of various helper forms and view classes for the pmr2
libraries.
* Provide a wrapped BrowserView class that can adapt to multiple wrapper
templates much like how plone.z3cform does, so that views don't invoke
items that may not be available due to lack of a full portal.