split *.descartes.model.repository package:

- connector for performance data repositories has been moved to *.descartes.evaluation.performance
- logic for handling model files will be moved to *.descartes.model

git-svn-id: https://se1.informatik.uni-wuerzburg.de/usvn/svn/code/DMM/trunk@16122 9e42b895-fcda-4063-8a3b-11be15eb1bbd