patch: FFT 1D / 2D / M bug fixes and test enhancements.

[Stefan Seefeld]

The attached patch enhances the fft_be.cpp tests to cover all
1D, 2D, and M Fft variants, inclusively non-square and non-unit-stride
matrices. Doing this revealed a number of (more or less subtle) bugs
in the various backends, which are now fixed.

(There is still one case that I didn't manage to fix: the c->r dft 2D
  case. If anybody wants to have a look, that would be appreciated.
  The relevant code is in fft/dft.hpp:386. The appropriate tests in fft_be.cpp
  are commented out for the moment.)

The only remaining issue, then, is the finalization of the 3D FFTs,
which is rather simple, as only fftw and dft support it.


Regards,
		Stefan
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