Correct duplicate derived_from
Correct duplicate derived_from

Sometimes the list of derived-from files can duplicate matching files, which causes their QC nodes not to appear. This fix notices the duplications and doesn’t add duplicate nodes.

T2DREAM/t2dream-portal,T2DREAM/t2dream-portal,ENCODE-DCC/encoded,ENCODE-DCC/encoded,ENCODE-DCC/encoded,ENCODE-DCC/encoded,T2DREAM/t2dream-portal,T2DREAM/t2dream-portal