TraceLength needs to be given (if not equal to the default defTraceLengthRaw 160) only in CrystalProducer.
PreprocessingFilter will take the actual length from the value stored in the frame data:crystal.
PreprocessingFilter and PSAFilter use defTraceLengthPSA (=60) and defTraceSample (=10) for the length and position of the preprocessed trace.
Modified also the mechanism to read from PCIe : now the ring-buffer manager which assigns the slots to be consumed is non blocking and returns EvAgain if the requested mezzanine is not yet available


git-svn-id: svn://gal-serv.lnl.infn.it/agata/trunk/narval_emulator@761 170316e4-aea8-4b27-aad4-0380ec0519c9