InstData Import flagstat and metrics modifications.

It seems odd, I know. The import process will result in a paired and singleton file per read group. This basically is a check that they don't get mixed up. The test example singleton file has exact r1/2  and reads paired in sequencing is equal to total reads. I was going off the file name, but then i needed to have adding the metrics in it's own thing and thought it was a hacky to look at the file name.