rose bush cycles: print each cycle's last activity
Update for pre-release
Merge pull request #1370 from matthewrmshin/rose-bush-cycles-last-seen

rose bush cycles: print each cycle's last activity
t/rose-app-upgrade/06-broken.t: now more robust

A left over `*.pyc` created at the beginning of the test file could
cause the final tests to fail.

Also removed some carriage return characters.
Merge pull request #1373 from matthewrmshin/fix-t-app-upgrade-06

t/rose-app-upgrade/06-broken.t: now more robust
Docs: convert to ISO 8601

A first attempt.
Docs: remove cold start references

And other improvements.
Fix tutorial suite syntax

Was missing `graph=`.
tutorial doc: update `rose date` offset syntax
Tutorial docs: fix duration syntax
Fix example suite syntax spacing
Tutorial doc: ISO 8601 clock-triggered syntax
Doc: update for cylc 6

Fix directory path for `work/`.
Remove unnecessary comments.
Merge pull request #1374 from matthewrmshin/doc-iso8601

 Docs: convert to ISO 8601
rose bush jobs: fix status for retried jobs

A failed job to be retried should be marked failed.
Merge pull request #1378 from matthewrmshin/fix-rose-bush-jobs-retry

rose bush jobs: fix status for retried jobs