
Merges segments that have the same ratio_median and are in the same chromosome arm.
GatherSegmentsByRatioMedianHelper.RdTakes segment data (df) and gathers/merges the segments according to their ratio_median or chromosome arm.

GatherSegmentsByRatioMedianHelper.RdTakes segment data (df) and gathers/merges the segments according to their ratio_median or chromosome arm.