Test cases from Cowlishaw, v2.57. All are pased cleanly.
diff --git a/Lib/test/decimaltestdata/ddCopySign.decTest b/Lib/test/decimaltestdata/ddCopySign.decTest
index 7c83416..36b060e 100644
--- a/Lib/test/decimaltestdata/ddCopySign.decTest
+++ b/Lib/test/decimaltestdata/ddCopySign.decTest
@@ -17,7 +17,7 @@
-- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK --
-- mfc@uk.ibm.com --
------------------------------------------------------------------------
-version: 2.56
+version: 2.57
-- All operands and results are decDoubles.
precision: 16