v0.7.0

• A new global flag, -liquidity-stickiness, enables fee "stickiness" before it is updated. The idea is to help minimize unnecessary gossip if a channel's liquidity keeps going over a threshold. So if a channel moves from 85% to 75% local liquidity and there is a threshold at 80%, it would normally have its fees updated. But if the stickiness setting is set at 10%, the channel will have to get to 70% (80% - 10%) before its fees are updated. The stickiness setting is only enabled when channel liquidity is heading in a more "balanced" direction.