Fix Prisoner, Case, CaseRecord, CaseStep tables for initial English run
Fix Prisoner, Case, CaseRecord, CaseStep subclassing and tables
Fix PostTrialLog model and tables
Fix many-to-many cases-sources relation
Enforce only 1 official and 1 unofficial CaseRecord per Case using subclasses of CaseRecord and has_one in Case
Add working form_for Case with fields_for CaseRecords, CaseSteps