Can disconnect client anytime during the simulation. Can also disconnect the backup servers. Can add a backup server

 - When the server goes down and the backup takes over a client going down would not be noticed by the backup server.
 - The problem was the backup server was never monitoring the clients. This is now fixed

Added functionality so that the output structure and forcing structure are reused instead of deallocated and reallocated

Can get 1 HRU managed by the file access actor. An HRU will wait until it is told it can write again.