Minor changes, got the bf_decode_debug.c code working, successfully
writing debug data.
Added visualise_debug.py which displays the debug information while using the bf_decode_debug spead callback for beamformer observations with kat7. Currently only display files where there is some kind of inconsistency. I define a consistency as a file where the gradient of the debug information is not constant. The gradient will always be constant if the file was written correctly and there were no missing packets.