t/rose-task-run/*-iso.t: fix mixed cylc 5/6 syntax

Also make `t/rose-suite-run/14-reload-null.t` more robust.
Merge pull request #1369 from matthewrmshin/fix-t-mixed-cylc-5-6

t/rose-task-run/*-iso.t: fix mixed cylc 5/6 syntax
rose bush cycles: print each cycle's last activity
rose suite-clean --only=GLOBS

New `--only=GLOBS` option to restrict items to be cleaned.
Improve diagnostic.

rose test battery: use number of processors as number of jobs.
Merge pull request #1371 from matthewrmshin/rose-suite-clean-only-share-work

rose suite-clean --only=GLOBS
rose bush: fix jobs list

Broken since cylc/cylc#1012.
Merge pull request #1372 from matthewrmshin/fix-rose-bush-jobs-mp

rose bush: fix jobs list
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.
Use isodatetime-2014.08.0-4-ged54df8
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.