Added 'this-ancestor-children' alias support.
Added 'this-ancestor-children' alias support.

ikresoft/django-sitetree,RamezIssac/django-sitetree,idlesign/django-sitetree,PukeCloud/django-sitetree,PukeCloud/django-sitetree,idlesign/django-sitetree,caktus/django-sitetree,caktus/django-sitetree,ikresoft/django-sitetree,RamezIssac/django-sitetree