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/max.decTest b/Lib/test/decimaltestdata/max.decTest
index 9798ae2..88d0b5e 100644
--- a/Lib/test/decimaltestdata/max.decTest
+++ b/Lib/test/decimaltestdata/max.decTest
@@ -1,6 +1,6 @@
 ------------------------------------------------------------------------
 -- max.decTest -- decimal maximum                                     --
--- Copyright (c) IBM Corporation, 1981, 2004.  All rights reserved.   --
+-- 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      --
@@ -17,7 +17,7 @@
 --   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         --
 --   mfc@uk.ibm.com                                                   --
 ------------------------------------------------------------------------
-version: 2.39
+version: 2.56
 
 -- we assume that base comparison is tested in compare.decTest, so
 -- these mainly cover special cases and rounding
@@ -331,6 +331,33 @@
 maxx466 max -1000  -1E+3    -> -1000
 maxx467 max -1E+3  -1000    -> -1000
 
+-- rounding (results treated as though plus)
+maxexponent: 999999999
+minexponent: -999999999
+precision: 3
+
+maxx470 max  1      .5     ->  1
+maxx471 max  10     5      ->  10
+maxx472 max  100    50     ->  100
+maxx473 max  1000   500    ->  1.00E+3 Rounded
+maxx474 max  10000  5000   ->  1.00E+4 Rounded
+maxx475 max  6      .5     ->  6
+maxx476 max  66     5      ->  66
+maxx477 max  666    50     ->  666
+maxx478 max  6666   500    ->  6.67E+3 Rounded Inexact
+maxx479 max  66666  5000   ->  6.67E+4 Rounded Inexact
+maxx480 max  33333  5000   ->  3.33E+4 Rounded Inexact
+maxx481 max  .5     1      ->  1
+maxx482 max  .5     10     ->  10
+maxx483 max  .5     100    ->  100
+maxx484 max  .5     1000   ->  1.00E+3 Rounded
+maxx485 max  .5     10000  ->  1.00E+4 Rounded
+maxx486 max  .5     6      ->  6
+maxx487 max  .5     66     ->  66
+maxx488 max  .5     666    ->  666
+maxx489 max  .5     6666   ->  6.67E+3 Rounded Inexact
+maxx490 max  .5     66666  ->  6.67E+4 Rounded Inexact
+maxx491 max  .5     33333  ->  3.33E+4 Rounded Inexact
 
 -- overflow tests
 maxexponent: 999999999
@@ -348,13 +375,13 @@
 maxx512 max  0.10E-999       0  ->   1.0E-1000 Subnormal
 maxx513 max  0.100E-999      0  ->   1.0E-1000 Subnormal Rounded
 maxx514 max  0.01E-999       0  ->   1E-1001   Subnormal
--- next is rounded to Emin
+-- next is rounded to Nmin
 maxx515 max  0.999E-999      0  ->   1.00E-999 Inexact Rounded Subnormal Underflow
 maxx516 max  0.099E-999      0  ->   1.0E-1000 Inexact Rounded Subnormal Underflow
 maxx517 max  0.009E-999      0  ->   1E-1001   Inexact Rounded Subnormal Underflow
-maxx518 max  0.001E-999      0  ->   0E-1001   Inexact Rounded Subnormal Underflow
-maxx519 max  0.0009E-999     0  ->   0E-1001   Inexact Rounded Subnormal Underflow
-maxx520 max  0.0001E-999     0  ->   0E-1001   Inexact Rounded Subnormal Underflow
+maxx518 max  0.001E-999      0  ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
+maxx519 max  0.0009E-999     0  ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
+maxx520 max  0.0001E-999     0  ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
 
 maxx530 max -1.00E-999       0  ->   0
 maxx531 max -0.1E-999        0  ->   0
@@ -368,6 +395,27 @@
 maxx539 max -0.0009E-999     0  ->   0
 maxx540 max -0.0001E-999     0  ->   0
 
+-- misalignment traps for little-endian
+precision: 9
+maxx551 max      1.0       0.1  -> 1.0
+maxx552 max      0.1       1.0  -> 1.0
+maxx553 max     10.0       0.1  -> 10.0
+maxx554 max      0.1      10.0  -> 10.0
+maxx555 max      100       1.0  -> 100
+maxx556 max      1.0       100  -> 100
+maxx557 max     1000      10.0  -> 1000
+maxx558 max     10.0      1000  -> 1000
+maxx559 max    10000     100.0  -> 10000
+maxx560 max    100.0     10000  -> 10000
+maxx661 max   100000    1000.0  -> 100000
+maxx662 max   1000.0    100000  -> 100000
+maxx663 max  1000000   10000.0  -> 1000000
+maxx664 max  10000.0   1000000  -> 1000000
+
+-- payload decapitate
+precision: 5
+maxx670 max      11 -sNaN12345678901 -> -NaN78901  Invalid_operation
+
 -- Null tests
 maxx900 max 10  #  -> NaN Invalid_operation
 maxx901 max  # 10  -> NaN Invalid_operation