Jobs, Tasks, and Commands

TODO: write about the pipeline from job submission to command execution.

Task Statuses

The following table shows the meaning of the different task statuses:

Status	Meaning	Possible next status
`queued`	Ready to be worked on by a Worker	`active`, `canceled`
`active`	Assigned to a worker for execution	`completed`, `canceled`, `failed`, `soft-failed`
`soft-failed`	Same as `queued`, but has been failed by a worker in an earlier execution	`completed`, `failed`, `canceled`
`completed`	Worker executed the task succesfully	`requeued`
`paused`	Not yet implemented