[swarm_ctrl] Updated to use newest bitcode with ADC SPI read fix.
[swarm/data] Reduced sleep in packet reader from 100 ms to 10 ms.

May need to be reduced further or remove altogether to speed things
up. Actually ideally this should be replaced entirely with a select-
based capture code.
[swarm/core] Fixed bug where false failures were getting logged at ADC calibration.

This was due to checking "if var" when var can be either None (on failure) or possible
0 (on success). So even though 0 was a successful outcome it would still get logged as
a failure. This was fixed by using "if var is None" instead.

Also used the new pretty print feature for the ADC MMCM glitch profile from commit
sma-wideband/adc_test@65a2ef4.
[swarm/core] Moved the setup of the visibility output to _after_ syncing.