Changes made to gstlal_inspiral_plot_snr to make it python3-compatible
Changed lines 66, 67, 75, 76, 98 of gstlal/bin/gstlal_inspiral_plot_snr by making the zip object into a list because zip object does not have lengths. Added line 45 'cache = list(map(CacheEntry, open(options.input)))' to load the snr cache files with respect to the instructions at 'https://lscsoft.docs.ligo.org/lalsuite/lal/classlal_1_1utils_1_1cache_1_1_cache_entry.html'