remove function _remove_fks and use djangos ForeignKey.on_delete=SET_NULL instead
fix todo: delete TaggedItems instead of Tags (as they may have relations other Content) and afterward delete Tags without any relations left
move delete logic from lfc/manage/views.py to BaseContent.delete. This ensures that the related objects are also deleted if the object is deleted by a delete cascade (emulated by django), e.g. if a ContentObject that has children is deleted via manage-interface. In this case the prior implementation did not delete the related objects of the children.
This approach also removes some redundant code in lfc/manage/views.py
Merge pull request #5 from myvision-de/completely_delete_children

Completely delete related objects of BaseContent children