Merged revisions 63078 via svnmerge from

Merged revisions 63078 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

When forward porting this, I added _PyUnicode_InsertThousandsGrouping.

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  r63078 | eric.smith | 2008-05-11 15:52:48 -0400 (Sun, 11 May 2008) | 14 lines

  Addresses issue 2802: 'n' formatting for integers.

  Adds 'n' as a format specifier for integers, to mirror the same
  specifier which is already available for floats.  'n' is the same as
  'd', but inserts the current locale-specific thousands grouping.

  I added this as a stringlib function, but it's only used by str type,
  not unicode.  This is because of an implementation detail in
  unicode.format(), which does its own str->unicode conversion.  But the
  unicode version will be needed in 3.0, and it may be needed by other
  code eventually in 2.6 (maybe decimal?), so I left it as a stringlib
  implementation.  As long as the unicode version isn't instantiated,
  there's no overhead for this.
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