FEATURE: Time card system

Other work colleges need a timecarding system, similar to our Tracy Ultratime system. A minimal timecarding system should:

- Allow a student to clock in and clock out
- Allow a student to review their time cards
- Allow the supervisors to view, edit, delete, and add entries
- Allow the supervisor to approve, reject entries
- Allow supervisors to schedule students for specific hours
- Allow supervisors to view summaries of hours (bulk students, bulk hours/weeks/months/life, ... )
- Warn supervisors of over- and under-hour situations
- Allow labor administrators to do everything a supervisor can do
- Allow labor administrators to review hours for payroll processing (see issue about payroll system)