cylc.batch_submit: print command's stderr/stdout
Added submission logging with test.
cylc gui: dialog for log file read failure
Merge pull request #719 from benfitzpatrick/cylc.task-log

cylc gui: dialog for log file read failure
Merge pull request #718 from arjclark/submit-out-err-print

cylc logs: record submit out err
Merge remote branch 'upstream/master' into expand-battery-6