----------------------
- Testing: Derive test layers from ZopeLite layer if available.
- exportimport: Scripts with invalid types imported
after scripts with valid types will no longer place the valid
script twice. Scripts can also now be specified with meta_types
other than the hard-coded meta_types.
- AfterTransitionEvent now passes along the new status of the
object, just as StateChangeInfo passes on the new status to
after-transition scripts.
(http://www.zope.org/Collectors/CMF/490)