Note that a number of the changes listed below were not applicable to the Py3k branch, and hence the corresponding
files are unchanged in this checkin. This checkin is also the first time the environment checking in regrtest has
been forward ported to the Py3k branch.

This checkin causes test_xmlrpc to fail - see issue 7165 (it's a bug in the 3.x version of xmlrpc.server)
I am also getting a failure in test_telnetlib, but it isn't clear yet if that is due to these changes.

Recorded merge of revisions 75400-75401,75404,75406,75414,75416,75422,75425-75428,75435,75439,75441-75444,75447-75449,75451-75453,75455-75458,75460-75469,75471-75473,75475-75477,75479-75481,75483,75486-75489 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r75400 | r.david.murray | 2009-10-14 23:58:07 +1000 (Wed, 14 Oct 2009) | 6 lines

  Enhanced Issue 7058 patch, which will not be backported.  Refactors the
  code, adds checks for stdin/out/err, cwd, and sys.path, and adds a new
  section in the summary for tests that modify the environment (thanks to
  Ezio Melotti for that suggestion).
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  r75453 | nick.coghlan | 2009-10-17 16:33:05 +1000 (Sat, 17 Oct 2009) | 1 line

  Correctly restore sys.stdout in test_descr
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  r75456 | nick.coghlan | 2009-10-17 17:30:40 +1000 (Sat, 17 Oct 2009) | 1 line

  Enhancement to the new environment checking code to print the changed items under -vv. Also includes a small tweak to allow underscores in the names of resources.
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  r75457 | nick.coghlan | 2009-10-17 17:34:27 +1000 (Sat, 17 Oct 2009) | 1 line

  Formatting tweak so that before and after values are vertically aligned
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  r75458 | nick.coghlan | 2009-10-17 18:21:21 +1000 (Sat, 17 Oct 2009) | 1 line

  Check and revert expected sys.path alterations
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  r75461 | nick.coghlan | 2009-10-18 00:40:54 +1000 (Sun, 18 Oct 2009) | 1 line

  Restore original sys.path when running TTK tests
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  r75462 | nick.coghlan | 2009-10-18 01:09:41 +1000 (Sun, 18 Oct 2009) | 1 line

  Don't invoke reload(sys) and use StringIO objects instead of real files to capture stdin and stdout when needed (ensures all sys attributes remain unmodified after test_xmlrpc runs)
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  r75463 | nick.coghlan | 2009-10-18 01:23:08 +1000 (Sun, 18 Oct 2009) | 1 line

  Revert changes made to environment in test_httpservers
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  r75465 | nick.coghlan | 2009-10-18 01:45:52 +1000 (Sun, 18 Oct 2009) | 1 line

  Move restoration of the os.environ object into the context manager where it belongs
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  r75466 | nick.coghlan | 2009-10-18 01:48:16 +1000 (Sun, 18 Oct 2009) | 1 line

  Also check and restore identity of sys.path, sys.argv and os.environ rather than just their values (this picked up a few more misbehaving tests)
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  r75467 | nick.coghlan | 2009-10-18 01:57:42 +1000 (Sun, 18 Oct 2009) | 1 line

  Avoid replacing existing modules and sys.path in import tests
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  r75468 | nick.coghlan | 2009-10-18 02:19:51 +1000 (Sun, 18 Oct 2009) | 1 line

  Don't replace sys.path in test_site
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  r75481 | nick.coghlan | 2009-10-18 15:38:48 +1000 (Sun, 18 Oct 2009) | 1 line

  Using CleanImport to revert a reload of the os module doesn't work due to function registrations in copy_reg. The perils of reloading modules even for tests...
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  r75486 | nick.coghlan | 2009-10-18 20:29:10 +1000 (Sun, 18 Oct 2009) | 1 line

  Silence a deprecation warning by using the appropriate replacement construct
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  r75489 | nick.coghlan | 2009-10-18 20:56:21 +1000 (Sun, 18 Oct 2009) | 1 line

  Restore sys.path in test_tk
........