all decoders: introduce a reset() method Move initialization code of protocol decoders from the constructor to a new reset() helper method. The libsigrokdecode backend could run this method several times to clear the decoder's internal state, before new data from another acquisition gets fed to decode() calls.
Various PDs: Drop currently unsupported probes in stacked PDs. At the moment we don't yet support PDs which take both input from another PD (which they're stacked on top of) and from one or more logic inputs/pins. This will be supported later on, and at that time we'll bring back these changes.