This patch will add a ParentDepth policy limitation for content/create.
Just like ParentClass limits object creation to parent nodes of the
selected classes, the ParentDepth limitation limits object creation
to parent nodes with the selected depths.
Please comment and give a rating if you found this useful.
This code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.