Featurerequest: create an ibexa dynamic query with the parent location of the current displayed location

[fwoldt]

We want to create a generic layout for example for an article
which will also show a grid with all articles which located in the same container like the current article.

So we need the parent location id of the current location ( where the layout is connected) to create an ibexa dynamic query.

The idea is to add a new option "use parent location as parent"

[fwoldt]

we create a pull request with a first implementation #8