Boxes: Update boxes and tests

...iemannian/bci-examples/2.1-Matrix-Classifier-Training.xml

...ssing/riemannian/box-tutorials/1.4-Classifier-Trainer.xml

...ssing/riemannian/box-tutorials/1.5-Classifier-Testing.xml

.../src/boxes/ovpCBoxAlgorithmCovarianceMatrixCalculator.cpp

...boxes/ovpCBoxAlgorithmCovarianceMatrixToFeatureVector.cpp

...an/src/boxes/ovpCBoxAlgorithmCovarianceMeanCalculator.cpp

...n/src/boxes/ovpCBoxAlgorithmMatrixClassifierProcessor.cpp

...ian/src/boxes/ovpCBoxAlgorithmMatrixClassifierTrainer.cpp

...nnian/src/boxes/ovpCBoxAlgorithmMatrixClassifierTrainer.h

plugins/processing/riemannian/src/ovp_defines.h

plugins/processing/riemannian/src/ovp_main.cpp

plugins/processing/riemannian/test/DartTestfile.txt

...-tests/Matrix-Classifier-Testing-Model-FgMDM-RT-input.xml

...ios-tests/Matrix-Classifier-Testing-Model-FgMDM-input.xml

...ests/Matrix-Classifier-Testing-Model-MDM-Rebias-input.xml

...arios-tests/Matrix-Classifier-Testing-Model-MDM-input.xml

...narios-tests/Matrix-Classifier-Testing-Supervised-ref.csv

...arios-tests/Matrix-Classifier-Testing-Supervised-test.xml

...rios-tests/Matrix-Classifier-Testing-Unsupervised-ref.csv

...ios-tests/Matrix-Classifier-Testing-Unsupervised-test.xml