How is the minimum tx fee set?
Hi,

How is the minimum tx fee set? e.g. if I do a transaction with PRIO_UNIMPORTANT I currently seem to pay 0.00000878 XMR in fees. Where is this set exactly? In the `daemon.py` code I can see a function that oddly enough seems to get the recent few tx fees from coinbase??? However, I don't think that code is actually being invoked. So how is the minimum tx fee being derived?