* Support fatal errors in job reports
* WIP: JobReporter and JobInspector
* WIP: JobReportHook and JobReportRef
* Add ChunkError type and asyncRun helper method
* Rename JobReport to JobProgress
* Return a closed channel from Done when the JobProgress is nil
* Comment catchFirstFatal function
This will concatenate all errors together into a single string. When
possible, it would be better to log the actual errors slice to take
advantage of structured logging.
Miccah