Consider dropping 'host' parameter from .mdl files
.mdl files specify the host name the model is expected to run on. We should consider removing that specification.
This value is now little used, perhaps only in the IPC lists.
It can also be incorrect. Models can be started on other hosts, so probably the hostname specified in the file shouldn't be used at run-time. It might give a false sense of security that a model is being run on the correct host.