Automated testing improved

Features:
- Major refactoring and cleanup of the code
- Fixed/added tests
- Metric-plugin system and Processor-plugin system haven been overhauled to use the special Statistics-datamodels
- Added additional runners to automatically test multiple configurations of the near-duplicate detection algorithms (changing parameters, such as the threshold and the feature-size)
- FeatureTypes (used in the near-duplicate detection algorithms) can now be adjusted using the settings-file or the database-configuration.
- Multiple runners to automate the testing on multiple levels.

Basically the suite is now able to run tests completely automated for multiple thresholds and muliplt variations in the settings of the nnd-algorithms