First step in cleaning up our tasks, remove the tic, toc, and rid fields, i.e. make them optional for debugging.
These values are currently only being used for:
- Task reweighting with wall-clock values, which is dubious at best and has been removed for now,
- Repartitioning, which can also be done with the pre-computed task cost estimates.
- Some error checking in the scheduler, but it's all cases that would cause failures elsewhere, so they won't be missed,
- Generating task plots, which is still possible if configured with
--enable-task-debugging.