Hot fix polling for tasks with an explicit 'owner'.

Affects polling and therefore restart when active tasks are present. Bug
introduced by 8bbbd481f52.
Updated change log for 5.4.3.
Updated the gh-pages updater script.
Remove duplicated items from gui stop-suite dialog.
Fixed some dire formatting in main CLI help.
Made stop command usage clearer.
Merge pull request #803 from hjoliver/800.stop-command-doc

cylc stop command doc update