added support for events #373
removed debug statements
format change
various fixes, especially relationships and xrefs
fixed partner entries; added literals; other fixes
Merge pull request #378 from micheldumontier/drugbank

Drugbank update
Merge pull request #379 from micheldumontier/pharmgkb

various fixes, especially relationships and xrefs
Merge pull request #380 from micheldumontier/clinicaltrials

Clinicaltrials