Solve problems in new event_file (VALID_NUM and red_d22.cal) and improve usability
Valid_num was added as part of an option to select 'manually' the triggers to use when binning the data, but tests done on 22/11/2018 with data from experiment 9-10-1526 (cycle 183) failed. Additionally, the stretching of the tubes using the file 'red_d22_tube_peak_fit_det.dat' is not needed with the new electronics. The export fails now because the file is not present, so this has to be changed.