Avoid deprecated RMISecurityManager?

In Java 8 the RMISecurityManager has been deprecated, saying we should generally use the superclass SecurityManager instead.

In Taverna Server we use RMISecurityManager in TavernaRunManager and in AbstractRemoteRunFactory

Donal - do you think this would work well with just SecurityManager in these places? Why is RMISecurityManager deprecated?

Note: We use RMI for internal communication between Taverna Server and the individual worker process (which runs executeworkflow) - which may run as different Unix workers.