Adjusted overflow logic in DateIndex and DateRangeIndex to work with latest ZODB 3.10.0b4. Instead of an OverflowError a TypeError is raised now.

Made sure to exclude a number of meta ZCML handlers from ``zope.*`` packages where Zope2 provides its own implementations.

Expand test isolation to cover all global state, include default map functionality inspired by experimental.catalogqueryplan

Prevent ZopeTestCase to load any ZCML as a side-effect of calling Zope2.app(). Loading ZCML has to be deferred to layer setup time.