- All tests (I hope) now properly remove completed.data on exit, which
should prevent certain non-deterministic tinderbox results caused by
residual data.
- Implemented API calls: task_get_due, task_get_end, task_get_entry,
task_get_start, task_get_until and task_get_wait.
- Implemented unit tests for API calls.
- Implemented new Record::get_ulong method.
- Implemented unit tests for get_ulong.