o Issue deprecation warning on import of the Interface package). That package
  is already gone on the trunk.

Merged the slinkp-datetime-200007 branch: fix the DateTime(anotherDateTime) constructor to preserve timezones.

'unrestrictedTraverse' (apparent NameError).

is ready to serve requests. You can subscribe to this event e.g.
for starting application-level threads. 

o Also, use tagged release of ZODB-based externals.

Base the default location of softwarehome on Zope2, which is guaranteed not to be a namespace but always located inside the Zope2 software home. This fixes Zope2 breaking on systems which uses namespace packages for Products.*

Revert c81408 HelpSys changes, it didn't make much of a difference. Making the whole help system optional would be a better approach.

Revert ISO8601 interpretation to previously broken behaviour (assume GMT rather than local time as per spec)