SF feature request #686323:  Minor array module enhancements

array.extend() now accepts iterable arguments implements as a series
of appends.  Besides being a user convenience and matching the behavior
for lists, this the saves memory and cycles that would be used to
create a temporary array object.
diff --git a/Misc/NEWS b/Misc/NEWS
index dfe6e2f..d4aef1e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -182,7 +182,9 @@
 
 - array objects now support the copy module.  Also, their resizing
   scheme has been updated the same as for list objects.  The improves
-  performance for append() operations.
+  the performance (speed and memory usage) of append() operations.
+  Also, array.extend() now accepts any iterable argument for repeated
+  appends without needing to create another temporary array.
 
 - cStringIO.writelines() now accepts any iterable argument and writes
   the lines one at a time rather than joining them and writing once.