exposed purgeAllDrugEvents in service
fixed event saving to use trigger for eventConcept and query for finding obs
Merge pull request #5 from jlkeiper/DRUGHIST-7

Updates related to REPORTS-224
Added params to DrugEvent methods
DRUGHIST-8 - DrugSnapshot model, tables, service and DAO
merging with upstream
DRUGHIST-9 added encounters to DrugSnapshots
added a way to retrieve regimens
updated drug events to match liquibase db config
updated drug event discovery process to work faster
added UUID to snapshot generation and cohort param for getting snapshots
Merge pull request #6 from jlkeiper/DRUGHIST-8

DRUGHIST-8 - adding support for DrugSnapshots
Merge pull request #7 from jlkeiper/DRUGHIST-9

DRUGHIST-9 adding encounter to snapshots
added missing chunk for regimen drug table
added encounter copying to cloning method
fixed firefox bug missing label for select options
fixed focus issue on regimen form