visitExistRule and instrExistRule are now conditionally validated as
required based on the patientOnlyImport flag
setting instrument caregiver now sets the instantiated Caregiver on the
instrument caregiver property, rather than setting a caregiver ID on a
mapped instrument caregiver id property. this was necessary because if
the caregiver had just been created as part of the import there would be
no caregiver ID to set on the instrument caregiver id property. now,
Hibernate takes care of it on save

set up exception handling in the saveImportRecord method