Added automatic inline migration for databases created with older Zope versions. The `Versions` screen from the `Control_Panel` is now automatically removed on Zope startup.

Removed more unused code of the versions support feature including the Globals.VersionNameName constant.

Make the set_attributes and set_schema options to <class ...><require ... /></class> issue a warning rather than throw an exception. Whilst the concept doesn't make much sense in Zope 2, it's desirable to be able to re-use existing packages that do declare such protection

add "python" option to zope.conf schema allowing for a python binary to be specified, allowed a Zope instance to run from any buildout with the appropriate eggs.

necessarily the same as the one used to run mkzopeinstance.

a Zope 2 meta-egg

Simplified buildout configurations by removing references to '${buildout:eggs}'.
They are not needed because there is only one egg (Zope2) required for each part