Backport 120813 from trunk (don't crash when using Expressions in Worklists) and add missing log of previous change

in Zope 2.13, the CMF permission declarations have been moved to CMFCore. this means that on Zope 2.13 CMFCore 2.2.2 is a minimum dependency, but I'm not sure how to declare that

- complete changelog from 2.1 branch
- RST fixes

- updated some imports
- removed obsolete BBB code

  formatted string (as before), but also a qualified TAL
  expression, meaning it has a prefix like "string:", "python:".
  (https://bugs.launchpad.net/zope-cmf/+bug/378292)

  make sure older export files remain supported.

  bypass added.
  (https://bugs.launchpad.net/zope-cmf/+bug/308947)

o Don't import from Globals;  instead, use real locations.

o Make other imports use the actual source module, rather than an
  intermediate (e.g., prefer importing 'ClassSecurityInfo' from
  'AccessControl.SecurityInfo' rather than from 'AccessControl').

o Avoid relative imports, which will break in later versions of Python.

 - Strip final newline here when importing, otherwise it would not match against a translation msgid (see: http://dev.plone.org/plone/ticket/8525)

  (and long dead) base_cms product.

  and transition actions and their GenericSetup profiles.

- merge all 2.1.x changes from the monolithic CHANGES file at
  http://svn.zope.org/CMF/branches/2.1/CHANGES.txt?rev=87755&view=auto