Merged revisions 74184,74230 via svnmerge from

Merged revisions 74184,74230 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r74184 | georg.brandl | 2009-07-23 08:08:58 +0100 (Thu, 23 Jul 2009) | 1 line

  #6548: dont suggest existence of real and imag functions in cmath.
........
  r74230 | mark.dickinson | 2009-07-28 17:12:40 +0100 (Tue, 28 Jul 2009) | 4 lines

  Issue #6458: Reorganize cmath documentation into sections (similar to
  the way that the math documentation is organized); clarify section on
  conversions to and from polar coordinates.
........