Actually specify the direct dependendies on zope.container and zope.site we have gotten in recent updates

OFS.ObjectManager now fully implements the zope.container.IContainer interface and no longer just claims to do so. See the changelog for details and how backwards compatibility is handled.

Switched Products.PageTemplates to directly use zope.i18n.translate and removed the now obsolete GlobalTranslationService hook.

- Launchpad ##332168: Connection.py: do not expose DB connection strings
  through exceptions

Removed bridging code from Product.Five for PlacelessTranslationService and Localizer. Neither of the two is actually using this anymore.

Made the specification of `SOFTWARE_HOME` and `ZOPE_HOME` optional. In addition `INSTANCE_HOME` is no longer required to run the tests of a source checkout of Zope.