- QueryEngine integration done (but not functional yet, debugging required)
- Changed behavior on exceptional conditions: if SensorNavigator or
AnalyticsManager initialization fails, termination follows
- Now the QueryEngine can also access output sensors of other Analyzers
- Minor bugfixes

- First step for integration of the analytics framework in the collectagent
- QueryEngine and REST API integration still missing
- Proper testing still to be done
- Added a probe function: the global config file is scanned before
initialization, and if no data analytics plugins are requested, no
sensor navigator is built

- A nicer and refactored version of the "average" plugin
- Allows to perform arbitrary aggregation operations over sensors, like
sum, average, or maximum

- Auto-publish is now case insensitive with respect to the <sensor> and
<group> patterns
- If an invalid pattern was specified (missing <sensor> clause) the
configuration is aborted
- Checks for the uniqueness of sensor and group names have been
temporarily dropped as they interfere with templates and entities
(until we find a good solution for MQTT topics)