Incorrect interface for wisdom routines?

The interface we provide for read/save wisdom (our fftw_wisdom wrappers) does not match the actual implementation – the interface specifies an integer return code (e.g. here), whilst the implementation has a void return value.

Our interface actually matches the fftw provided methods of the same name (e.g. fftw_export_wisdom_to_filename). The simplest fix is probably to delete fft_save_wisdom.c and to change the name in the bind statement (e.g. here) to the fftw provided routine. This might require us to set a minimum FFTW version of 3.3

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