Review convolution with resolution function
Convolution of measured signal with resolution function is implemented in Device/Resolution/Convolve.cpp. Foundations are described in paper by Jeremy Fix, ba-intern/lit/JFix_FFTConvolution.pdf.
The current code supports several modes, of which only one FFTW_LINEAR_SAME
is actually used. The others can probably be removed.
Our resolution functions are symmetric. This should result in a substantial simplification. Possibly, we can get rid of all imaginary parts.
Hopefully, we can get rid of negative output (#864).