Evolutions um die Personalpunkte nach Intervalle eingeben zu koennen.

Allerdings schinet das hinzufügen der Tabelle fuer Intervalle nicht von evolution bemerkt worden zu sein :-(
fixed the bug that splits always redirected to persons ; should now work with general splitable admins
moved personalpunkte from stellenwertigkeit into separate table. Adapted the consistency checking somewhat (but taht might need more finetuning)
Merge branch 'stellenwertigkeit-intervalle'
Fixed the url tag from 1.4 to 1.5 syntax
initial data put into a fxiture to make initializing easier
various filters now work with the reorganized model
Beginn einer Dokumentation
Merge commit 'd91bacdf14b15f15645ddd5a7b771a25c6590fc6'
switching to django 1.7
fixing the Vertrag - PersonenZugane model , also in admin
more comments,
python coding standards improved