Forcing python script to output as utf8

tools/conlluAddMissingColumns.py

 #! /usr/bin/python3
 
 import sys
+import codecs
+sys.stdout = codecs.getwriter('utf8')(sys.stdout)
+sys.stderr = codecs.getwriter('utf8')(sys.stderr)
 
 def printUsageAndExit() :
   print("USAGE : %s file.conllu mcd"%sys.argv[0], file=sys.stderr)