It should cycle the utxos in .wallet.json #8
Description
After eg 'node dunes.js batchMintDune 100000000 23
' (which does not cause too-long-mempool-chain), if you run it again, it uses the same large funding utxo (at least it does if you delete the 1.5 doge thing (#3)). So it gets stuck for a while with too-long-mempool-chain. So at the end of batchMintDune it should move the 1st utxo in .wallet.json to the end of the file.