Replace 'alwaysRemoveFromValidator' flag with null check on automaticModelRunsStartDate (whether we are in disease group setup)
Use automaticModelRunsStartDate as comparisonDate if it is later than createdDate
If, during the weekly process, the occurrence hasn't received reviews when it's coming off DataValidator, set isValidated to null
Long line
Test name and doc
Tweaks from review
Merge pull request #226 from SEEG-Oxford/306-is-validated

Refinements to taking points off the DataValidator