Merged revisions 1667-1674 via svnmerge from

Merged revisions 1667-1674 via svnmerge from
http://scons.tigris.org/svn/scons/branches/core

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  r1672 | stevenknight | 2006-11-03 23:11:52 -0600 (Fri, 03 Nov 2006) | 1 line

  0.96.D480 - Don't use UNIX logic to detect an executable qmtest.py on Windows.
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  r1673 | stevenknight | 2006-11-03 23:18:59 -0600 (Fri, 03 Nov 2006) | 1 line

  0.96.D481 - Remove the print statement from the previous checkin.
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  r1674 | stevenknight | 2006-11-03 23:25:43 -0600 (Fri, 03 Nov 2006) | 1 line

  0.96.D482 - Create a env.Clone() method and encourage its use in favor of env.Copy().
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git-svn-id: http://scons.tigris.org/svn/scons/trunk@1675 fdb21ef1-2011-0410-befe-b5e4ea1792b1