This mode copies data from the servant nodes to the master node and
was created to reduce the amount of time spent relaying information
back to the master. One send data task is assigned to each servant
node. If many replicates are run on the same host, it is much more
efficient to send all of the information back to the master at once,
rather than piecemeal. The send data mode also performs rudimentary
housekeeping on the remote node, cleaning up after the servant tasks
and preparing for the next time pLUCAS is run.