Improvements and cleanup to the routines fft_forward and fft_backward routines
Description
Renamed and overloaded the different flavours of fft_forward and fft_backward. Removed two wrapper functions in nfft that seemed useless and renamed some of the routines for greater consistency.
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Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Closes #297 (closed)
Edited by Martin Lueders