The blockstream API is too unstable or blocks users after too few
requests. This commit changes the default API server to
api.node-recovery.com (hosted by guggero).
This commit adds a new command to the chantools tool which allows
users to RBF inputs. In case a channel opening transaction is stuck
in the mempool, this command can be used to RBF spend the inputs
of the channel opening transaction to a different address.