Event messages

Since a netlet runs on a remote node, viewing the standard I/O stream (System.out, System.err) might seem unlikely.

In fact it is available via the console's dmesg command, which displays all the latest standard I/O messages from all the netlets on that hosting service. This is handy for debugging, logging, etc. However, the hosting service cannot reasonably hold all messages indefinitely, so we can expect it to drop messages if they are not picked up in time.

This facilility is actually a specialised version of a more general feature of the hosting service which enables various events to be gathered, then released via IHostingControlFacet. The dmesg command requests a StdioEvent, but others are defined in org.jtrix.project.nodality.facet.audit.