Run pit remove using the flooding approach

def pitremove(np, dem, filleddem, workingdir=None, mpiexedir=None, exedir=None, log_file=None,
                  runtime_file=None, hostfile=None):
        """Run pit remove using the flooding approach """
        fname = TauDEM.func_name('pitremove')
        return TauDEM.run(FileClass.get_executable_fullpath(fname, exedir),
                          {'-z': dem}, workingdir,
                          None,
                          {'-fel': filleddem},
                          {'mpipath': mpiexedir, 'hostfile': hostfile, 'n': np},
                          {'logfile': log_file, 'runtimefile': runtime_file})