- Allow starting the DebugAPI from the node via config
- In StateDB:
- Make checkpoints when ProcessTxs() succeeds
- Remove extra hardcoded `statedb` path that was redundant
- Replace hardcoded `[:4]` by `[:]` when parsing idx, which failed because
idx is 6 bytes length now.
- Extra: In node, use waitgroup instead of `stoppedXXX` channels to wait for
syncrhonizer goroutines to finish.