- Simplified folder removal; now properly relies on foreign keys for dependency resolution
- simplified *propertiesSet() methods by offloading input validation and query building to a generic function
- Implemented function to get the properties of a single folder (useful for internal use)
- Implemented a function to set the properties of a folder
- Test files now consist entirely of traits:
- General setup trait mocking User class and cleaning up
- Driver trait to set up the database connection
- Series trait containing tests for the series, independent of driver used
