Minor changes for EUDAQ-based stable test beam operation

This merge request follows a successful DESY beam test with PS module. It includes minor changes here and there to fix/improve the stability of the data taking :

• One additional function in the D19cL1ReadoutInterface to check if the DDR3 is almost full
• Avoiding hard coded enabling of the data_handshake inside the D19cL1ReadoutInterface::ReadEvents() function. Rather rely on settings file.
• Changing the name of beam test tool from BeamTestCheck2S to BeamTestCheck as it is now used for both 2S and PS
• Fixing eudaq producer connection by uncommenting lines in the eudaqprocuer.cc executable
• In the eudaq producer, not waiting anymore for the DDR3 memory to be almost full to readout events as this cause overflow and data header corruption.