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patches: fix DateTime 2.12.7 copy_reg monkey patch so that it does not affect pickle 🤔 is this really safe ? 🚧

This business template conflicts with full_text_mroonga_catalog, because
it overrides same paths. Because this bt is generally not recommended
and might even be removed, it's better not to complicate coding style test
infrastructure to support this pattern.

This backports parts of zope commit bb7837c66 (Explicitly make all
classes new-style., 2017-09-15) and 173658008 (Fix unpickling of instances
those base class changed to a new-style class. (#208), 2017-10-24),
so that business template is same between zope4 and zope2 and so that
business templates created with zope4 can still be installed on zope2.