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
cylc performance boosting: GUI backwards compatibility
Added shutdown handling for deleted run dir.
Add timeout handler to test suite.
Environment filtering for #781
Added a test for environment filtering.
Merge pull request #806 from arjclark/fix-shutdown-on-del-dir

fix failure to shutdown if a suite's run dir is deleted
Added an environment exclusion filter.
Updated filter documentation.
Merge branch 'master' into cylc-daemon-performance-rebase
Space after comma.
Removed "poor suite design" slur!
Fix get-config test for new environment filter section.
Merge pull request #807 from hjoliver/781.environment-filtering

Support environment filtering
Merge branch 'master' into cylc-daemon-performance-rebase