- Now using references instead of pointers
- Return type is now bool

- Make clean might be required

- Test plugin that can be used to evaluate the performance and functionality
of the query engine and unit system

- An OpenCV-based regression plugin using Random Forest models
- Also added a few missing copy constructors

- Compiles fine but completely untested for the moment
- Also addressed many bugs for job analyzer templates

- Now supports also standard deviation and percentile computation
- Multiple output sensors per analyzer can be defined, each performing
a different aggregation task
- QueryEngine has been slightly modified so as not to clear the input
sensor reading buffer (if any), thus allowing to accumulate sensor
values with subsequent calls

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