bbctl: add retransmit option to receive

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>
bbctl: set training bytes in ms

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>
bbctl: fix data format string

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>
bbctl: fix list header

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>
bbctl: improve spectrum command

Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.org>