Built against `master` branch 801dd40666d1e6009920ad3ff755c7bb993b2a62:

If I have no wallet.dat file and run:

    bitcoind -usehd=0

A new wallet.dat file is created and an HD seed is assigned.

I see an error message in the source:

    "Error loading %s: You can't disable HD on an already existing HD wallet or create new non-HD wallets."

but that doesn't get shown because `fFirstRun` is true, and so the code which checks for `-usehd` values doesn't run.

If it's no longer possible to create non-HD wallets, specifying -usehd=0 when creating a wallet should be an error, and not get silently ignored.
if (nDepth == 0 && pcoin->mapValue.count("replaces_txid")) {
                safeTx = false;
            }
            
            
            
            
            
            
            
            
            if (nDepth == 0 && pcoin->mapValue.count("replaced_by_txid")) {
                safeTx = false;
            }
            if (fOnlySafe && !safeTx) {
                continue;
            }
            if (nDepth < nMinDepth || nDepth > nMaxDepth)
                continue;
            for (unsigned int i = 0; i < pcoin->tx->vout.size(); i++) {
                if (pcoin->tx->vout[i].nValue < nMinimumAmount || pcoin->tx->vout[i].nValue > nMaximumAmount)