Modify cal-removal in merged mock data.
Modify pipeline to save cal-removal output file.
Print total number of rows removed when preprocessing mock data.
Merge branch 'V-2' of /home/plazar5/research/PALFA/pipeline2.0 into V-2
Modified datafile.py so writing cal rows file works when there are 0 rows removed.
Added CalRemovalSummary and NumCalRowsRemoved diagnostics to diagnostics.py. But not yet activated in DIAGNOSTIC_TYPES.