Merged revisions 20737 via svnmerge from 
svn+ssh://bugman@svn.gna.org/svn/relax/trunk

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  r20737 | bugman | 2013-09-02 11:15:53 +0200 (Mon, 02 Sep 2013) | 5 lines
  
  The isInf() and isNan() functions of lib.float can now handle values of None.
  
  If None is encountered, the functions simply return False.
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