Make replicate executable.
Fix up the socat wrapper script that can spawn many replicate servers
Include websockify in replicate_server, for one-click awesomeness.

Also, use unix sockets for websockify<->socat instead of TCP, which would mean wasting a port.

Also, give a more meaningful name to the backend postgres->replicate socket
Old WAL reverse-engineering script fixed up and repurposed for testing socat.
Sketch out websockets<-->replicate