Work in progress (for next version):
  none, we are ready for 2.3.0 beta test

Probably:
- Macros to do date/time arithmetic.
- 'limits' for tasks, not just for allocations.
- Interactive account report
- Add C++ style // comments.

Maybe:
- Make vacations and shifts scenario specific.
- Timezone support for resources and shifts.
- Limits for accounts.
- support for renewable resources
- Allocation selection by skill set.
- Add support for flexible rates (per task, per shift)
- Cleanup taskjuggler library API, so it can be used by other apps.
- Color support for tasks and resources.
- Gap with snap on weekdays.
- Macros like ${TODAY}, ${ProjectStart}, ...

