Make inlined inclusion markers into comments.

So the inlined file validates during the edit session.
Sensible suite-dependent default visualization cycles.
Merge pull request #793 from hjoliver/sensible-vis-default-times

Sensible suite-dependent default visualization cycles.
Allow "cylc view" to display inlined edit markers.
Added tests for include-file inlining.
Merge pull request #792 from hjoliver/inlined-include-edit

Make inlined inclusion markers into comments.
Print blanks instead of 'None' in get-[global-]config output
Merge pull request #799 from hjoliver/config-print-blanks

Print blanks instead of 'None' in get-[global-]config output
Hot fix polling for tasks with an explicit 'owner'.

Affects polling and therefore restart when active tasks are present. Bug
introduced by 8bbbd481f52.