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Don't fetch the OPA libraries when they are already installed via RPM. Add the OPA plugin to the list of plugins to be built by default.

- New filtering methods applies a filtering regular expression to all
node names in the node list of a job; the mode of the filtered node names
is then computed, and the job is processed only if this matches an
arbitrary "match" string
- Can be used to assign jobs to different islands in a HPC system based
on the allocation of nodes

- Uses an overloaded version of the querySensor() method

- Allows to encode "not set" states for single members

- Basic implementation that allows to publish sensors as operations
of other sensors
- Still not functional and untested

Should not break CPU sensor instatiation anymore
Invalidates commit 1a5e05a7

- Sensor/Group overwriting broke CPU sensor instantiation
- Looking for a more robust solution

- Prevented instantiating sensors from templates within template groups

Pusher SensorGroupTemplate: Also replace partial template specialization with derived SensorGroupTemplate for entities

Pusher: Refactor ConfiguratorTemplate once again. Replace partial template specialization with derived ConfiguratorTemplate for entities

- This allows to use additional features in the plugin, e.g. templates
for single sensors

- The interval field now defaults to the value inherited from the
sensor groups that the sensor belongs to
- Metadata blocks in templates can now be overwritten completely or
only in part

setting publish to false for sensors which get aggregated to another sensor (they shouldn't be published).

-CollectAgent and Pusher adapted for special handling of event data
-Handful of other fixes and improvements

-can send event data from cali service to pusher plugin
-refactored sample data symbol lookup: is now done by cali service
-cali service only sends timestamp and data-string to pusher plugin
-outstanding TODO: push event data into separate Cassandra table

- Especially useful in Collect Agent: now there is no need to restart
the CA to instantiate operator plugins after sensors have been
published

- Collectagent uses published TTL values and caches received metadata
- READMEs updated accordingly