The muse_zap.py script contains the zap.py code  by
Soto et al. (2016), version 1.1.dev

The original code has been changed in order to be compatible with
older version of astropy, i.e. the astropy.units module is not
used. Also it has been modified to be compatible with the reflex
environment (lines from 1286 in the muse_zap.py are added).
