Merged revisions 80004 via svnmerge from

Merged revisions 80004 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r80004 | r.david.murray | 2010-04-12 12:35:19 -0400 (Mon, 12 Apr 2010) | 13 lines

  Issue #7585: use tab between components in unified and context diff headers.

  Instead of spaces between the filename and date (or whatever the string
  is that follows the filename, if any) use tabs.  This is what the unix
  'diff' command does, for example, and difflib was intended to follow
  the 'standard' way of doing diffs.  This improves compatibility with
  patch tools.  The docs and examples are also changed to recommended that
  the date format used be the ISO 8601 format, which is what modern diff
  tools emit by default.

  Patch by Anatoly Techtonik.
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