aact-272: Incremental load: For each study, we delete existing study data then reload with fresh xml.  But the delete is taking ~42 seconds per study. Changed so that all studies to be refreshed are deleted with SQL commands.   
aact-272: Incremental load: For each study, we delete existing study data then reload with fresh xml.  But the delete is taking ~42 seconds per study. Changed so that all studies to be refreshed are deleted with SQL commands.   
ctti-clinicaltrials/aact,tibbs001/aact-1,tibbs001/aact-1,tibbs001/aact-1,ctti-clinicaltrials/aact,ctti-clinicaltrials/aact