Display which cron jobs aren't running

This type of information is recorded in the error log - would it be a better idea record this info in a file (or both places)?

So there could be a file in dataroot called: log/cron.log where it could record information and that file could then be read into the admin section somewhere - the log file could keep only so many lines maybe.

The "cron is not running" message comes from this:

$data['cronrunning'] = !record_exists_select('cron', 'nextrun IS NULL OR nextrun < CURRENT_DATE');

So, the cheap and easy way of resolving this issue would be to check which crons are returned by that query, and list them in the cronnotrunning message.

In the long run, we should probably file a feature request for a big fancy admin report that shows you all the cron jobs, when they're scheduled to run, when they last ran, and that lets you turn them on and off and reschedule them.

ANOTHER thing to note -- the current code doesn't check all the plugin cron tables, like activity_cron, interaction_cron, etc. So, the cron for one of the plugins could be broken, and there'd be no warning to the admin.