gstlal_inspiral_compress_ranking_stat: modify the two print lines to be python3 compatible

gstlal-inspiral/bin/gstlal_inspiral_compress_ranking_stat

@@ -100,7 +100,7 @@ for filename in filenames:
 
 	rankingstat, rankingstatpdf = far.parse_likelihood_control_doc(xmldoc)
 	if rankingstatpdf is not None and options.verbose:
-		print >>sys.stderr, "WARNING: \"%s\" contains a RankingStatPDF object, it is not a pure ranking statistic file, you might be using this program on the wrong files." % filename
+		print("WARNING: \"%s\" contains a RankingStatPDF object, it is not a pure ranking statistic file, you might be using this program on the wrong files." % filename, file=sys.stderr)
 	# FIXME:  don't hard-code object name
 	name = u"gstlal_inspiral_likelihood"
 	elem = rankingstat.get_xml_root(xmldoc, name)
@@ -144,8 +144,7 @@ for filename in filenames:
 			j += 1
 		del items[j:]
 		if options.verbose:
-			print >>sys.stderr, "\"%s\":  %s horizon history reduced to %.3g%% of original size" % (filename, instrument, 100. * j / (i + 1.))
-
+			print("\"%s\":  %s horizon history reduced to %.3g%% of original size" % (filename, instrument, 100. * j / (i + 1.)), file=sys.stderr)
 		# replace
 		rankingstat.numerator.horizon_history[instrument] = type(horizon_history)(items)