suite database: more suite parameters and suite events

[hjoliver]

(this should probably be sucked into The Great Refactor).

[edit: issue title changed from "suite state should record cylc version"]

Parameters:

• cylc version - this would allow us to abort a restart-with-new-cylc-version cleanly with a sensible message if some non backward compatible change is ever necessary.
• UTC mode or time zone.
• type of suite start (cold/warm).
• suite is held?

Events (or checkpoints):

• time of suite start.
• times of suite reload/restart (already stored as checkpoints).
• configuration used to start/reload/restart (already stored under log/suiterc/).
• times of suite shut down.
• reasons of suite shut down?
• times when timed out or stalled.
• suite event handler statuses?

Note: A suite can shut down for various reasons:

• normally because the final cycle point was reached - see change run command semantics? #1030 (comment)
• stop point or task
• command
• task failure, timed out or stalled
• died

See also #864.

[matthewrmshin]

See also #421, #705 and #864.

[benfitzpatrick]

See #1827 - @matthewrmshin might add this in there.

[benfitzpatrick]

if a suite has shut down normally because the final cycle point was reached

It might be nice if cylc gui could somehow grab this information to notify the user.

[matthewrmshin]

(Edited original comment - added items from #705 and turned list into check list.)