Add warnings to the strop module, for to those functions that really
*are* obsolete; three variables and the maketrans() function are not
(yet) obsolete.

Add a compensating warnings.filterwarnings() call to test_strop.py.

Add this to the NEWS.
diff --git a/Misc/NEWS b/Misc/NEWS
index d69c45f..f9f1855 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -87,6 +87,10 @@
 
 Library
 
+- strop is now *really* obsolete (this was announced before with 1.6),
+  and issues DeprecationWarning when used (except for the four items
+  that are still imported into string.py).
+
 - Cookie.py now sorts key+value pairs by key in output strings.
 
 - pprint.isrecursive(object) didn't correctly identify recursive objects.