Zope.location

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- Fix a typo in the configure.zcml.

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- Remove dependency on zope.copy: the LocationCopyHook adapter is registered
only if zope.copy is available.

- Use the standard Python doctest module instead of zope.testing.doctest, which
has been deprecated.

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- Adjust to testing output caused by new zope.schema.

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- Move the IPossibleSite and ISite interfaces to zope.component as they are
dealing with zope.component's concept of a site, but not with location.

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- Add getParent() to ILocationInfo and moved the actual implementation here
from zope.traversal.api, analogous to getParents().

- Actually remove deprecated PathPersistent class from
zope.location.pickling.

- Move ITraverser back to zope.traversing where it belongs conceptually. The
interface had been moved to zope.location to invert the package
interdependency but is no longer used here.

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- New feature release: deprecate locationCopy, CopyPersistent and
PathPersistent from zope.location.pickling. These changes were already part
of the 3.5.3 release, which was erroneously numbered as a bugfix relese.

- Remove dependency on zope.deferredimport, directly import deprecated modules
without using it.