D-ITG control server: Handle errors in the receiver subprocess better.
With patched D-ITG, the log server is not necessary.
D-ITG control server: Make the max allowed test time a command line parameter.
D-ITG: Make the data file garbage collection be based on file
modification time.
D-ITG control: Signal error on empty data set.
D-ITG control: Signal all errors via dictionary rather than exceptions.
D-ITG control: Even more error handling in children.
D-ITG control: Assign ports to each ITGRecv instance and communicate it
to the sender.
D-ITG control: Limit max concurrent instances, protect against invalid data.