Get derived files from GET request
Get derived files from GET request

Reverse linking file.derived_from caused ElasticSearch to run out of memory on demos. So I removed that reverse link in the last commit and do a GET request to get files deriving from the one being looked at. Redmine #4650

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