Wrong stitching when binning_z and phase retrieval are activated
When using simultaneously phase retrieval and binning_z in multi-stage reconstruction, the stitching is not done properly.
Quick tests suggest that the solution would be to (1) multiply the (vertical) phase margin with binning (although we already have
options["phase"]["delta_beta"] /= (binning * binning) in
ProcessConfig) and (2) use the following in
curr_z_min += n_slices - margin_down*binning_z curr_z_max += n_slices - margin_down*binning_z