Catch exception on rolling_archive.
Merge pull request #828 from arjclark/fix.quota-exceeded-shutdown

#712: Catch exception on rolling_archive.
Implement pre-initial filtering for task messaging.
Added tests for pre-initial cycle messaging.
Document gcylc symlink in cylc-wrapper.
Merge pull request #832 from hjoliver/gcylc-wrapper

Allow "gcylc" for "cylc gui" with the cylc version wrapper.
Merge pull request #831 from arjclark/fix.pre-init-messages

#827: Pre-initial-cycle triggers are now ignored for message outputs