Fixed an error in the suicide tutorial suite.
Warn on suiciding an active task.
Log suicides.
Don't retry task message send if task proxy not found in suite.
cylc task messaging: alter send message logging
Merge pull request #837 from hjoliver/suicide-tutorial-typo

Fixed an error in the suicide tutorial suite.
Merge pull request #839 from hjoliver/834.suicide-warning

Log suicides, and warn if task is active at the time
Merge pull request #840 from hjoliver/836-unnecessary-messaging-retries

Don't retry task message send if task proxy not found in suite.
Merge branch 'master' into cylc.task-message-send-succeeded-bugfix
Fix releasing a suite with non-cycling tasks
Merge pull request #842 from benfitzpatrick/cylc.task-message-send-succeeded-bugfix

cylc task logging: "Send message 1 of 7 succeeded" bugfix
Merge pull request #843 from benfitzpatrick/cylc.fix-release-suite-non-cycling

Fix releasing a suite with non-cycling tasks
Updated change log for 5.4.7