added truncate property
import_log_message message 2000 chars
visitWindow list
visitWindow
instrCaregiver
get rid of instrument caregiver validation, now that using association
do not need extra mapping column for instrument caregiver id

fixed a few bugs with exist handling

visitType filter.addDaoParam was not being applied, resulting in
duplicate visits matched

new instrCaregiver flag used
metadata:
visitWindow
instrCaregiver x 10
instr_caregiver x 10
new instrCaregiver flag