AE: Move John's old code into a legacy subdirectory
AE: Add a GetRMSNoise() function to look at the RMS of the first n_samples. Also added a few comments
AE: Keep a track of the total RMS noise for each pulse and calculate the average. NB That this doesn't yet persist between events. Could I just use a histogram?
AE: Plot the RMSs into a histogram to get later
AE: Print out the 1-sigma, 3-sigma and 5-sigma levels of the RMS noise