Revert "Moving SyneRBI-Challenge nema-data utilities to SIRF (#1241)"

[KrisThielemans]

This reverts commit b90383e.

[evgueni-ovtchinnikov]

I do not mind reverting if what I have done is not good enough, but I am afraid I am completely lost now. If randoms cannot be computed for SPECT data, we need a method that computes prompts only, do we not? BTW is there a way to find out whether one has PET or SPECT data?

[KrisThielemans]

If randoms cannot be computed for SPECT data, we need a method that computes prompts only, do we not?

sure, but we have one already, i.e. the set_input, process(), get_output().

BTW is there a way to find out whether one has PET or SPECT data?

You have to get into stir::ExamInfo::imaging_modality. We don't expose any of that to SIRF, and will have to.