- Set the _rois attribute when calling run(). - Add additional filtering when calling cnv_merger method to remove clustered   events whose mean zscore is below threshold.
- Set the _rois attribute when calling run().
- Add additional filtering when calling cnv_merger method to remove clustered
  events whose mean zscore is below threshold.

sequana/sequana,sequana/sequana,sequana/sequana,sequana/sequana,sequana/sequana