first merge with PubMed and using SNOMED for HOIs. NOTE: several problems exist: the mergeCountsFromIntegratedSources.py script does some odd renumbering. The query that maps to SNOMED is too slow and is not approved as final. Also, the code that generates the uniq_drug_hoi_relationships.csv runs at the end of the script and needs to be incremental.
bug fixes to the merge script : index now corrected, cache snomed concept mappings, logging of drug ids so that its possible to recover from a crash