added a check for duplicate inputs in the group name lists, rnaseq_util.py
added a check for duplicate inputs in the group name lists, rnaseq_util.py

kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbase/KBaseRNASeq