Merge branch 'develop' into release-8.1.0

Author: mesmith75

doc/fill_gpi.py

@@ -10,7 +10,7 @@
 import sys
 import os
 import inspect
-from itertools import izip_longest
+from itertools import zip_longest
 import shutil
 
 doc_dir = os.path.dirname(os.path.realpath(__file__))