Support for shorter time-periods than 5 minutes

Prolly need to implement a check-scheduler so we can graph on intervals down to, say - 5, seconds. Look at doing this together with zoomable graphs.

This should probably be postponed for a complete sample scheduling redesign: - I want nodes to be able to sample themselves and report all data "since the last update" when the updater connects to them. This enables important nodes to be graphed across network downages - The scheduling must be done with a process rather than a cron-job to obtain good results - And the more frequent sampling must scale, which probably dictates sharing the job between the server and the node

Sampling redesign underway.

A patch for UpdateWorker?.pm to support RRD with 30 second sample interval. In order to use it, you have to edit munin-cron to disable munin-update. run munin-update seperately every 30 seconds.

Patch to add an update_rate plugin general config

Initial support added in r3322.

munin-update remembers when it was last run and it can be scheduled every minute. Every plugin that have to special config will only be updated every 5 mins.

This enables plugins that are quite expensive to generate but don't vary much to be scheduled only every hour, day, ...

On the other side, sub-minute sampling is quite difficult to have right now, since for now the update is crontab-scheduled.

Am I right - approved part of patch doesn't increase resolution of .rrd files and so are fully useless in getting 1 minute graphs even if specify update_rate?!

30 seconds interval is obviously useless under "usual" conditions but can be useful if do functionality of "real-time" plot like it does in that plugin for Cacti (i.e. in "manual mode" updating). Moreover, 1 minute interval will be very useful in "crontab-mode", so why don't approve other part of patch, rewrite it before to support 60sec instead of 30sec step?

current trunk fully supports custom update_rate, and increase resolution of .rrd files accordingly.

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