[patch] Some enhancements to the FFT code.

[Stefan Seefeld]

Please find attached two patches (folded into one):

The SAL FFT backend uses a number of different
functions that take temporary workspace, to avoid
the input array to be clobbered. This is a first
step to allow the frontend not to copy data in
some (the most frequent ?) cases.

The second part of the patch is the addition of
tests to tests/fft.cpp that specifically targets
the Complex_split_fmt. It passes with builtin fft
(i.e. FFTW), and I'm planning to add support for
split format to the SAR backend in the coming
days.

Regards,
		Stefan
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