Log Message:
Update to 0.6.2

Fixed:
- cleaned up, clarified internal caching API in *dbm backends
- stopped pyc writing to current directory! yay! (patch 800718 with changes)
- fixed file leak in detector initialisation (patch 800715)
- commented out example tracker homes (patch 800720)
- added note about hidden :template var in user.item (bug 799842)
- fixed Apply Error that was raised, when property was deleted from class and
  we are trying to edit an instance