Enhancements suggested by John Ackermann N8UR

[fventuri]

John Ackermann N8UR suggested a couple of enhancements (http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/2024-February/001777.html):

(a) ability to zoom the spectrum display further, and/or a separate spectrum/waterfall of just the passband; and

(b) display of passband power, total front-end power, and other channel statistics that are presented by the control program.

[ka9q]

(a) will take quite a bit of work inside ka9q-radio since the smallest supported spectral bin is currently 40 Hz, based on the 20 ms frame time and the 1/5 block overlap.