Merge pull request #36 from thelabtech/MH-543

Hide organizaton setting option in the menu
Merge pull request #37 from thelabtech/MH-355

Add birth_date format validation
MH-544
If we can't avoid the race condition, retry it
added_by_id is not part of the unique index
Skip person validation when importing from crs
Hide some predefined questions to avoid double survey questions
Merge branch 'MH-541' into dev