[collectd] New plugin: "Aggregation" creates aggregated metrics.

[Florian Forster]

Hi everybody,

the new *Aggregation plugin* has just been merged to the _master_
branch. With this new plugin it is possible to aggregate multiple
matching values into one using aggregation functions such as sum and
average. This allows to you create an aggregated view of the sum of
"cpu" metrics on each host, for example.

Feedback and bug reports are, of course, very welcome!

Here are some reference links:

  * An overview of the plugin in the wiki:
    <https://collectd.org/wiki/index.php/Plugin:Aggregation>
  * Wiki page with example configs (quite empty now, add yours!)
    <https://collectd.org/wiki/index.php/Plugin:Aggregation/Config>
  * Manpage entry:
    <http://octo.cx/mancollectdaggregation>

Best regards,
—octo
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