Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
fully updated to the latests Decimal Specification (v1.66) and the
latests test cases (v2.56).

Thanks to Mark Dickinson for all his help during this process.
diff --git a/Lib/test/decimaltestdata/copysign.decTest b/Lib/test/decimaltestdata/copysign.decTest
new file mode 100644
index 0000000..6b20fda
--- /dev/null
+++ b/Lib/test/decimaltestdata/copysign.decTest
@@ -0,0 +1,177 @@
+------------------------------------------------------------------------

+-- copysign.decTest -- quiet copy with sign from rhs                  --

+-- Copyright (c) IBM Corporation, 1981, 2007.  All rights reserved.   --

+------------------------------------------------------------------------

+-- Please see the document "General Decimal Arithmetic Testcases"     --

+-- at http://www2.hursley.ibm.com/decimal for the description of      --

+-- these testcases.                                                   --

+--                                                                    --

+-- These testcases are experimental ('beta' versions), and they       --

+-- may contain errors.  They are offered on an as-is basis.  In       --

+-- particular, achieving the same results as the tests here is not    --

+-- a guarantee that an implementation complies with any Standard      --

+-- or specification.  The tests are not exhaustive.                   --

+--                                                                    --

+-- Please send comments, suggestions, and corrections to the author:  --

+--   Mike Cowlishaw, IBM Fellow                                       --

+--   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         --

+--   mfc@uk.ibm.com                                                   --

+------------------------------------------------------------------------

+version: 2.56

+

+extended:    1

+precision:   9

+rounding:    half_up

+maxExponent: 999

+minExponent: -999

+

+-- Sanity check, and examples from decArith

+cpsx001 copysign   +7.50       11  -> 7.50

+cpsx002 copysign   '1.50'   '7.33' -> 1.50

+cpsx003 copysign  '-1.50'   '7.33' -> 1.50

+cpsx004 copysign   '1.50'  '-7.33' -> -1.50

+cpsx005 copysign  '-1.50'  '-7.33' -> -1.50

+

+-- Infinities

+cpsx011 copysign  Infinity       11 -> Infinity

+cpsx012 copysign  -Infinity      11 -> Infinity

+

+-- NaNs, 0 payload

+cpsx021 copysign         NaN     11 -> NaN

+cpsx022 copysign        -NaN     11 -> NaN

+cpsx023 copysign        sNaN     11 -> sNaN

+cpsx024 copysign       -sNaN     11 -> sNaN

+

+-- NaNs, non-0 payload

+cpsx031 copysign       NaN10     11 -> NaN10

+cpsx032 copysign      -NaN10     11 -> NaN10

+cpsx033 copysign      sNaN10     11 -> sNaN10

+cpsx034 copysign     -sNaN10     11 -> sNaN10

+cpsx035 copysign       NaN7      11 -> NaN7

+cpsx036 copysign      -NaN7      11 -> NaN7

+cpsx037 copysign      sNaN101    11 -> sNaN101

+cpsx038 copysign     -sNaN101    11 -> sNaN101

+

+-- finites

+cpsx101 copysign          7      11 -> 7

+cpsx102 copysign         -7      11 -> 7

+cpsx103 copysign         75      11 -> 75

+cpsx104 copysign        -75      11 -> 75

+cpsx105 copysign       7.50      11 -> 7.50

+cpsx106 copysign      -7.50      11 -> 7.50

+cpsx107 copysign       7.500     11 -> 7.500

+cpsx108 copysign      -7.500     11 -> 7.500

+

+-- zeros

+cpsx111 copysign          0      11 -> 0

+cpsx112 copysign         -0      11 -> 0

+cpsx113 copysign       0E+4      11 -> 0E+4

+cpsx114 copysign      -0E+4      11 -> 0E+4

+cpsx115 copysign     0.0000      11 -> 0.0000

+cpsx116 copysign    -0.0000      11 -> 0.0000

+cpsx117 copysign      0E-141     11 -> 0E-141

+cpsx118 copysign     -0E-141     11 -> 0E-141

+

+-- full coefficients, alternating bits

+cpsx121 copysign   268268268           11 -> 268268268

+cpsx122 copysign  -268268268           11 -> 268268268

+cpsx123 copysign   134134134           11 -> 134134134

+cpsx124 copysign  -134134134           11 -> 134134134

+

+-- Nmax, Nmin, Ntiny

+cpsx131 copysign  9.99999999E+999      11 -> 9.99999999E+999

+cpsx132 copysign  1E-999               11 -> 1E-999

+cpsx133 copysign  1.00000000E-999      11 -> 1.00000000E-999

+cpsx134 copysign  1E-1007              11 -> 1E-1007

+

+cpsx135 copysign  -1E-1007             11 -> 1E-1007

+cpsx136 copysign  -1.00000000E-999     11 -> 1.00000000E-999

+cpsx137 copysign  -1E-999              11 -> 1E-999

+cpsx138 copysign  -9.99999999E+999     11 -> 9.99999999E+999

+

+-- repeat with negative RHS

+

+-- Infinities

+cpsx211 copysign  Infinity       -34 -> -Infinity

+cpsx212 copysign  -Infinity      -34 -> -Infinity

+

+-- NaNs, 0 payload

+cpsx221 copysign         NaN     -34 -> -NaN

+cpsx222 copysign        -NaN     -34 -> -NaN

+cpsx223 copysign        sNaN     -34 -> -sNaN

+cpsx224 copysign       -sNaN     -34 -> -sNaN

+

+-- NaNs, non-0 payload

+cpsx231 copysign       NaN10     -34 -> -NaN10

+cpsx232 copysign      -NaN10     -34 -> -NaN10

+cpsx233 copysign      sNaN10     -34 -> -sNaN10

+cpsx234 copysign     -sNaN10     -34 -> -sNaN10

+cpsx235 copysign       NaN7      -34 -> -NaN7

+cpsx236 copysign      -NaN7      -34 -> -NaN7

+cpsx237 copysign      sNaN101    -34 -> -sNaN101

+cpsx238 copysign     -sNaN101    -34 -> -sNaN101

+

+-- finites

+cpsx301 copysign          7      -34 -> -7

+cpsx302 copysign         -7      -34 -> -7

+cpsx303 copysign         75      -34 -> -75

+cpsx304 copysign        -75      -34 -> -75

+cpsx305 copysign       7.50      -34 -> -7.50

+cpsx306 copysign      -7.50      -34 -> -7.50

+cpsx307 copysign       7.500     -34 -> -7.500

+cpsx308 copysign      -7.500     -34 -> -7.500

+

+-- zeros

+cpsx311 copysign          0      -34 -> -0

+cpsx312 copysign         -0      -34 -> -0

+cpsx313 copysign       0E+4      -34 -> -0E+4

+cpsx314 copysign      -0E+4      -34 -> -0E+4

+cpsx315 copysign     0.0000      -34 -> -0.0000

+cpsx316 copysign    -0.0000      -34 -> -0.0000

+cpsx317 copysign      0E-141     -34 -> -0E-141

+cpsx318 copysign     -0E-141     -34 -> -0E-141

+

+-- full coefficients, alternating bits

+cpsx321 copysign   268268268          -18 -> -268268268

+cpsx322 copysign  -268268268          -18 -> -268268268

+cpsx323 copysign   134134134          -18 -> -134134134

+cpsx324 copysign  -134134134          -18 -> -134134134

+

+-- Nmax, Nmin, Ntiny

+cpsx331 copysign  9.99999999E+999     -18 -> -9.99999999E+999

+cpsx332 copysign  1E-999              -18 -> -1E-999

+cpsx333 copysign  1.00000000E-999     -18 -> -1.00000000E-999

+cpsx334 copysign  1E-1007             -18 -> -1E-1007

+

+cpsx335 copysign  -1E-1007            -18 -> -1E-1007

+cpsx336 copysign  -1.00000000E-999    -18 -> -1.00000000E-999

+cpsx337 copysign  -1E-999             -18 -> -1E-999

+cpsx338 copysign  -9.99999999E+999    -18 -> -9.99999999E+999

+

+-- Other kinds of RHS

+cpsx401 copysign          701    -34 -> -701

+cpsx402 copysign         -720    -34 -> -720

+cpsx403 copysign          701    -0  -> -701

+cpsx404 copysign         -720    -0  -> -720

+cpsx405 copysign          701    +0  ->  701

+cpsx406 copysign         -720    +0  ->  720

+cpsx407 copysign          701    +34 ->  701

+cpsx408 copysign         -720    +34 ->  720

+

+cpsx413 copysign          701    -Inf  -> -701

+cpsx414 copysign         -720    -Inf  -> -720

+cpsx415 copysign          701    +Inf  ->  701

+cpsx416 copysign         -720    +Inf  ->  720

+

+cpsx420 copysign          701    -NaN  -> -701

+cpsx421 copysign         -720    -NaN  -> -720

+cpsx422 copysign          701    +NaN  ->  701

+cpsx423 copysign         -720    +NaN  ->  720

+cpsx425 copysign         -720    +NaN8 ->  720

+

+cpsx426 copysign          701    -sNaN  -> -701

+cpsx427 copysign         -720    -sNaN  -> -720

+cpsx428 copysign          701    +sNaN  ->  701

+cpsx429 copysign         -720    +sNaN  ->  720

+cpsx430 copysign         -720    +sNaN3 ->  720

+