pyInterface: convertEvtToTree

new converter python script for converting *.evt files to *.root files.
pyInterface: convertEvtToTree.py

New version using eventFileWriter.
pyInterface: convertEvtToRoot.py

Converter uses EventFileWriter now.
convertEvtToTree.py Exception handling
pyInterface/genPseudoData.py -> eventFileWriter
Implemented eventFileWriter into genPseudoData.
changed decayTopology to fix genPseudoData.py

Since the implementation of the eventFileWriter into genPseudoData.py the
arguments of decayTopology's methods (which took ROOT Objects) were
impractical. Changed the Python wrapper as well as the source files to
reflect the new handling. The changes in genPseudoData were minor.
pyInterface: genpw.py -> eventFileWriter

Implemented eventFileWriter into genpw.py. Still unsure if Comgeant output parts
should remain (only commented out for now).