[patch] fft_ext, window tests

[Don McCoy]

Attached is a patch that makes all of the "fft_ext" tests pass.  Also 
added conditional compiler directive such that it will build, run and 
pass even if no FFT is defined.  The fft_ext.cpp module may now be run 
on data files without command line options, provided that the first two 
letters of the filename indicate the desired fft type (c-c, c-r, or 
r-c).  It also runs both single and double precision FFT's on the data, 
unless an option is provided to select one or the other.

While making these changes, I also caught the fact that the window.cpp 
test also needed this conditional (because the Chebyshev function is 
dependent on FFT).

Ok to commit?

-- 
Don McCoy
CodeSourcery, LLC

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