Removed `this-parent-level-` aliases support (see #99).
Removed `this-parent-level-` aliases support (see #99).

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