Version 1.2
Fix the broken FIR filter scaling code, that I broke in v1.1, which:
- reduces the likelyhood of signal clipping (back to how it was in v1.0)
- allows the CW decoders to operate better again (back to how it was in v1.1)
also
- add an input clipping detection - now display '!' on the input volume display if the input is too loud and clipping
It is recommended to use this version in preference to v1.1.