Assorted fixes

While doing some cleanup with the unused imports, I also ran into various issues throughout that this MR fixes:

• Port various python2 print statements throughout
• gstlal_inspiral_calc_snr: Move missing_required_options upstream to avoid running into issues where it hasn't been defined yet
• Fix a couple of StringIO() calls that were not correct. (if StringIO is imported from io, it should be StringIO(), not StringIO.StringIO().
• chirptime.py file had Windows formatting, so that was converted via dos2unix
• Fix a couple of undefined variable problems due to typos.
• Remove unused variable in segments.py
• Fix wrong return type annotation in segments.py.

gstlal/python/segments.py

@@ -113,7 +113,6 @@ def query_dqsegdb_veto_segments(
 		segmentlistdict, the queried veto segments
 
 	"""
-	span = segments.segment(LIGOTimeGPS(start), LIGOTimeGPS(end))
 	if isinstance(instruments, str):
 		instruments = [instruments]
 
@@ -310,7 +309,7 @@ def split_segments_by_lock(
 	seglistdicts: segments.segmentlistdict,
 	boundary_seg: segments.segment,
 	max_time: float = 10 * 24 * 3600.,
-) -> segments.segmentlistdict:
+) -> segments.segmentlist:
 	"""Split segments into segments with maximum time and boundaries outside of lock stretches.
 
 	"""