Provide a logging formatter with compact file paths.
Fix marking tasks as merged.

Don't skip tasks with only one finished job.  This will then progress
through to the test of merge completeness and let lobster finish properly.
Fix job runtime imports and environment.

Copying via chirp was missing the proxy setting environment variable.  Job
report merging needed the module loading path fixed.
Add up jobits for merge jobs.

At the end, the sum of jobits from all successful jobs should equal the
jobits in the dataset.
Remove mode splitting for log and stats files.