Simplified the shutdown interface; made a 1-to-1 relation between network activity and the status of the Amiko thread.
Close paylink connection after commit; handle paylink closing more properly on both sides
Added payments log file class and setting
Implemented payment logging
Rename finlink to link (stage 1)
Rename finlink to link (stage 2)
Rename finlink to link (something I missed the previous commit)
Added micropayment channel class
Added balance attributes to the payment channel
Also use pretty print in the two nodes test
Make the socket readyForWrite event repeatable, so it becomes more like the other event types. This simplfies the code a bit.
Simplified the timer interface a bit, by letting the user set a relative time instead of an absolute timestamp