Remove returning valid for interpolation #73
Description
Currently, we return interpolated, valid after interpolation in both Interpolators (SequenceIterpolator here and here, ScreenInterpolator here) and Experiment (here), however, its not used in the actual dataset (example for ChunkDataset here) and I do not see a case where we would need this data, hence I suggest to discuss this and maybe remove valid and return only the interpolated values.