Five-intid

------------------

Bug fixes:


- Fix depecration warnings.
Update ``setup.py`` to depend on ``Zope2`` or ``Zope``, dependening on Python version.
[jensens] (1)
- Fix test to work correctly with ``zope.interface >= 5.1``.
[jensens] (17)

------------------

Bug fixes:


- Fixed ModuleNotFoundError: No module named 'App.class_init' on Zope 5.
[maurits] (15)

------------------

Bug fixes:


- Also catch KeyError when traversing to fix creating relations during Copy&Paste in Zope 4.
Fixes https://github.com/plone/Products.CMFPlone/issues/2866
[pbauer] (12)
- When looking up back-references the lookup using unrestrictedTraverse was way to slow.
A simplified traverse speeds up the lookup by up 80x. [jensens, 2silver] (14)

------------------

Bug fixes:


- Properly update the persistent objects stored in the initid utility btrees [ale-rt] (8)
- Also catch KeyError when traversing to fix creating relations during Copy&Paste in Zope 4.
Fixes https://github.com/plone/Products.CMFPlone/issues/2866
[pbauer] (12)

------------------

Bug fixes:


- Fix oid and root_oid that might have been accidentally converted to text when a DB was migrated from py2.
[pbauer] (7)

------------------

Bug fixes:


- Avoid a deprecation warning. [gforcada] (6)