Birth institution only created when answered in pregnancy visit instrument(s). #3489

Previously birth institution could be created when "Don't Know" or "Refused" are entered for birth location.
Birth institution only returned when answered in pregnancy visit instrument(s). #3489

Previously birth institution extraction could fail when "Don't Know" or "Refused" are entered for birth location.
Create birth institution record if type and name exist. #3489
Method is not used.
Removing unused optional parameters and clarifying institution type resolution. #3489
Comment on why no intitution is created at birth. #3489
Clarify comment. #3489
Merge pull request #79 from NUBIC/3489-institution_lookup

Fix pregnancy visit ODE failure when birth place doesn't exist