storageFormats: eventFileWriter.addEvent()

Update the eventFileWriter.addEvent() method to take TClonesArrays as
arguments. This makes copying trees much easier since now there is no need to
convert to lists.
pyInterface: improve convertTreeToEvt.py

Improve convertTreeToEvt.py by using the particleProperties to now correctly
convert the charge and energy to the output evt file. Add some exception
handling. Unfortunately there are still some round-off errors for the energy if
we convert from evt to the RootPwa format and back to evt.
pyInterface: genPseudoData.py bugfixes

Fix some bugs in genPseudoData.py.
1) Remove the command line argument for the particleDataTable since the
information is already given in the config file. Use the particleDataTable
given in the config file.
2) Save the weights in additionalVariables of the eventFileWriter. Don't use
the numpy double array. We can just use a normal python float since we use the
eventFileWriter now.
3) Change the progressBar to go from 0 to nEvents, not nEvents-1 (see recent
change)
pyInterface: deWeight.py

Add new script to remove weights from  event files.