remove nonrel requirements
change settings for database config
update install instructions
transition models to SQL-based relations
disable tests temporarily
tweak missing nullable flags on models

also add unicode and admin on models
rename PeriodicPointRecord model
add `last_changed_at` fields to models
adapt serializers and API to new models
add commented out classes for point record serialization
enable student-specific subresources
expose full behavior type resource inside incident
serve the static apps directly when in debug mode
fix README typo
fix pace index.html directory name
Merge branch 'relational-port'