change delimitor for multiple-barcode concatenation from slash to hyphen
change delimitor for multiple-barcode concatenation from slash to hyphen

alecw/picard,annkupi/picard,nh13/picard,nh13/picard,alecw/picard,annkupi/picard,broadinstitute/picard,broadinstitute/picard,annkupi/picard,broadinstitute/picard,alecw/picard,nh13/picard,annkupi/picard,alecw/picard,broadinstitute/picard,broadinstitute/picard,nh13/picard