fixes on the operators
type and safety beta!

* add testcasees for operators
* type conversion active
* swig stable
* bug fix: output operators (tuple)
* bug fix: sofanew.py fix coded executable path

TODO:
  * check all operators
  * converters for vtk/vtu files
  * Testing and TestCases
Merge remote-tracking branch 'origin/typeandsafety' into typeandsafety