Blocked revisions 72126-72127 via svnmerge

........
  r72126 | mark.dickinson | 2009-04-29 22:56:53 +0100 (Wed, 29 Apr 2009) | 2 lines

  Remove format_float and use _PyOS_double_to_string instead.
........
  r72127 | mark.dickinson | 2009-04-29 22:57:15 +0100 (Wed, 29 Apr 2009) | 2 lines

  Backport some of the float formatting tests from py3k.
........