Add "DnMinorHyd" to flowline_update.rds
We need to bring over "DnMinorHyd" from the original nhd data frame to be able to switch gage/facility COMID assignments from minor divergences to major where we find them.
We need to bring over "DnMinorHyd" from the original nhd data frame to be able to switch gage/facility COMID assignments from minor divergences to major where we find them.