merge
a real test for interpolated features and debug statements
interpolated and not now give the same result, but sliced and one-piece do not
now the one-piece and slice-wise non-interpolated features give the same results
interpolated and not-interpoalated equal slice by slice
interpolated one-piece does not work
all works, but full of debug statements
remove debug printout, add asserts
now also for data without channels
correct multifeature computations for non-interpolated
fix the offset again