Gm fix redpitaya

[GabrieleManduchi]

Avoid blocking burst recording in the possible case samples from previous burst are pending in queue without interrupt (no threshold reached)

[zack-vii]

maybe this branch should be rebased to disentangle all the merge commits.. btw you can use rebase as your default merge strategie

[WhoBrokeTheBuild]

@GabrieleManduchi, can you rebase this?