Basic functionality for split canary alerts.
Begin implementing map-canary queries. Started JobAlertUtil class for this kind of thing.
Put job alert form data into UI, and revise some parameter names.
Run canary checks at a larger interval due to their greater cost.
Implemented working query string expansion
Remove unneeded canary checkDates field. Update canary verification accordingly.
Improve log lines/system parameter consistency
Get rid of blank StreamSourceMeshy in JobAlertRunner by moving cache-key logic to util class
Fix some alert parameter issues that creeped in at some point