Requires:
~~~~~~~~~
-
New features:
~~~~~~~~~~~~~
-
Bug fixes:
~~~~~~~~~~
- The test 'if proxy' returned False on BTree proxies if they did not have any
  objects instead of testing the proxy existence.
New internal features:
~~~~~~~~~~~~~~~~~~~~~~
- Personal calendar is not created anymore by the CPSCore membership tool, but
  by the CPSDefault membership tool.
- A new method _notifyMemberAreaCreated has been added to the membership
  tool to perform actions just after member area has been created (does
  not do anything in CPSCore but sets title in overloaded method in
  CPSDefault)
