reorder edges with label obstructions

[alixander]

trafficstars

in this diagram, the long label on a connection placed there has nowhere good to go. it should be ordered with shorter connections, making more space for the long connection

client1

client2

server

redis

client1 -> server: updateBoard
server -> redis: broadcast request
server -> client1: undoData
redis -> server: request
server -> client2: request