Handle pedestal in PES and use GPU if available in BNN

See merge request !19

Estimate pedestal per channel and reduce memory usage by freeing unused variables as soon as possible. Not important usually, but avoids OOM crashes when dealing with very long traces.

Added better outlier detection and handle multi-pulse scenario better

See merge request !18

Make Torch optional and allow for backwards compatibility on autocovariance calculation

See merge request !17