EN_track math domain error

[bkatiemills]

EN_track appears bugged on the latest quota set from Tim; for example on his IQUOD_Quota_20.dat, EN_track throws

Traceback (most recent call last):
  File "AutoQC.py", line 96, in <module>
    parallel_result = processFile.parallel(filenames)
  File "/AutoQC/util/main.py", line 117, in easy_parallize
    result = pool.map(f, sequence) # for i in sequence: result[i] = f(i)
  File "/opt/conda/lib/python2.7/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/opt/conda/lib/python2.7/multiprocessing/pool.py", line 567, in get
    raise self._value
ValueError: math domain error

within the first 10 profiles. I will look into this more deeply in future, but since I'd like to focus on the new database backend which will dramatically change (and improve) how EN_track works, I'm just going to leave this as a todo until then.