train now remove any existing model in bin

UD_any/train.sh

@@ -73,6 +73,7 @@ if [ ! -d "$TEMPLATENAME" ]; then
   print_usage_and_exit
 fi
 
+rm -rf bin/$EXPNAME
 cp -r $TEMPLATENAME bin/$EXPNAME
 
 EVALCONLL="../scripts/conll18_ud_eval.py"