pull down to refresh

Yes, I originally used GetModifiedFee, which wasn't correct as the fee was modified with, IIRC, ancestors in ways that didn't work correctly with replace-by-fee-rate. So I changed it in a later commit to GetFee.
I believe that will also work incorrectly in cases where fees are manually prioritized, as, IIUC, manual priorities are done via GetModifiedFee. But I haven't had time (or funding) to fix those issues yet. This code is just testing the idea out right now.
Good work!