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Document FFTOperator and rename its "inverse_times" to "adjoint_times"

Merged Martin Reinecke requested to merge fft_op into master

This changes the interface of the FFTOperator according to today's discussions.

Documentation was added; tests have been adjusted.

NOTE: after this change, the Wiener filter demo no longer works, since it calls "inverse_times" for an FFTOperator.

Also, the SmoothingOperator no longer works, since it also requires the inverse FFT to work. I expect that it should not be allowed to work on spherical spaces anyway. Let's discuss this tomorrow.