I understand that Bitcoin-Qt 0.8.6 allows you to send < 0.01 BTC with 0 tx fee. After upgrading to this latest version, I tried to send something smaller than 0.01 BTC (but far above the dust level and with high enough priority) without tx fee in a normal way, but I couldn't do it. What should I do to fix this? Or, am I misunderstanding something?