Legacy: Two versions of Stimulation Based Epoching

See extras/plugins/processing/signal-processing/src/algorithms/epoching/ovpCAlgorithmStimulationBasedEpoching.*

sdk/plugins/processing/signal-processing/src/box-algorithms/epoching/ovpCBoxAlgorithmStimulationBasedEpoching.*

As far as I can tell, it is the second version that is available from the designer. The first one seems to be some old redundant code. Strangely,the codes seem very similar (so the chance that there was an initial copy is high), but the author and copyright have changed...