Add two new files and update remaining tests from the latest update of the
test suite in version 2.39 of dectest.zip.
diff --git a/Lib/test/decimaltestdata/plus.decTest b/Lib/test/decimaltestdata/plus.decTest
index f331901..a6d8e58 100644
--- a/Lib/test/decimaltestdata/plus.decTest
+++ b/Lib/test/decimaltestdata/plus.decTest
@@ -17,7 +17,7 @@
-- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK --
-- mfc@uk.ibm.com --
------------------------------------------------------------------------
-version: 2.38
+version: 2.39
-- This set of tests primarily tests the existence of the operator.
-- Addition and rounding, and most overflows, are tested elsewhere.