pyInterface: Update decayTopology's python interface.

Make decayTopology's {read, init}kinematicsData so that it still accepts
TClonesArrays also when called from python (like it's C++ counterpart). This
should also fix the python test again which was broken after the interface
change in 8e21edc6.
pyInterface: Add progressBar to convertEventFile.py.

Add a progressBar display to the convertEvtFile.py script.
pyInterface: clean up config file.

Delete a number of entries from the rootpwa config file which will not be
needed for the next incarnation of the user interface scripts.
pyInterface: Add first version of the file manager.

Add a first version of the file manager python class which should handle all
the file management of data and amplitude files (and possibly fit results and
fit configurations, but we are not there yet). The class is sparsely filled and
in an in-between state and more functionality will be added in the next
commits. Also add a small test script which tests the functionality which is
there at the moment, which will probably be deleted later on.