balance disputes when scout messages happen in parallel

[michielbdejong]

found loop (6:585) [] [ '1', '5', '1168', '4982', '1' ]
found loop (7:0) [] [ '1', '11', '4', '2', '1' ]
found loop (8:0) [] [ '1', '11', '4', '5', '1' ]
backtracked (9:0) [ '1', '11' ] [ '4' ]
file:///Users/michiel/gh/ledgerloops/jerboa/build/src/Jerboa.js:129
                throw new Error('balance dispute!');
                ^

Error: balance dispute!

[michielbdejong]

Temporary balance disputes are inevitable due to the Two Generals Problem. So maybe loop scouting should just play it safe, and take the minimum of incoming and outgoing. This does mean that it might take several sweeps to clear a loop, but eventually all transfers will settle, a zero balance will appear somewhere on the loop, and probes will move on.

[michielbdejong]

done