Math stuff

[Erlend Aasland]

Hi Han-Wen,

There is an old comment in flower/include/real.hh about MacOSX 10.3  
and g++ 3.3. Can I apply the attached patch? I guess we could replace  
the is_inf() with std::isinf() in flower/offset.cc too.

Regards,
  Erlend

math.patch
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