GitLab

- Based on the regressor plugin

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.

- A plugin based on gaussian mixture models to enable clustering for
performance variation analysis or outlier detection

- Allows to perform system-wide smoothing using only one accumulator per sensor
- Basic functionality works, more thorough testing to follow
- Metadata updating functionality still to be implemented

- MariaDB connector now compiles correctly on MacOS
- Perfevent DCDBPusher plugin re-added to targets

- "Fixed" segmentation fault occurring after the return of dcdbpusher's
main by not unloading dynamic libraries in PluginManager's destructor
- Error log messages in Aggregator plugin changed to Debug level
- Added Wno-unused-variable and Wno-unused-function compile flags
- Tweaked the stop method of TesterSensorGroup
- Re-worked the destructor of SARParser in ProcFS plugin

Move CXXFLAGS definitions to config.mk and thus streamline compiler flags for all Makefiles in subdirectories