pyInterface: add fileManager functionality

add some functionality to the filemanager:
1) create constructor for class
2) implement method getDataFilePaths that returns a list of all data files
3) implement method getBinID that returns the binID of a certain bin by
providing the bin information (dict of binninVariable to value inside bin)
4) implement method getBinFromID that returns a bin (list of tuples) when given
a bin ID. Should be improved to return binInformation (dict with
binningVariables in keys instead of just a list of tuples)