#101 netreceive: inlet to start/stop listening (in TCP mode)

[sistisette]

In TCP mode, netreceive should one or more inlets accepting messages to make it:
- close connection with a client
- stop/start listening and accepting for connections

In UDP mode it is not so necessary to be able to stop listening, because you can use a [spigot] to ignore the incoming messages, and listening to a UDP port won't prevent another application from listening on the same port (while in TCP mode it will).

However, I'm not sure of what happens if a UDP netreceive receives a packet that is not a valid FUDI message. If this can prevent later valid packets from being processed correctly, then a way of stop/start listening is necessary.