TODO

- add tab-completion for label during motivation grading
- add common labels to criteria.txt
- tab-completion does not work out of the box in the Mac terminal: https://github.com/ASPP/grader/issues/26
- add a `o` key to the grade verb that allows to set overrides. Fields that can be overridden must be tab-auto-completed and possible values for the field must be also tab-auto-completed.
- verify that we can dynamically change the formula and this has an effect on the ranking