SConstruct on OSX

i've fixed some stuff in SConstruct so it builds again on OSX. could  
a linux dev please apply the attached patch and check SC still compiles?

most prominent changes:

* convert tabs to spaces, use 4 spaces for indent
   (add corresponding note to top of file)
* add FFTW option
   * build with FFTW by default on linux
   * build with vecLib by default on osx

thx,
<sk>






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