metomi/rose#229: fix quoted widget
metomi/rose#229: document
metomi/rose#674: implement
rose suite-hook: update for cylc/cylc#477.

Should be backward compatible.
Merge pull request #675 from benfitzpatrick/229.quoted-widget

#229 - fix quoted widget
Merge pull request #676 from benfitzpatrick/674.rose-edit-fix-modify-latent-page

rose edit: fix modify latent page
Merge pull request #678 from matthewrmshin/cylc.477

rose suite-hook: update for cylc/cylc#477
Update CHANGES.md