Package comment for terminal.
Minimize the terminal sub-package exposure, add package comment.
Move Termios note so it isn't taken as package comment.
Move Termios note so it isn't taken as package comment.
Minimize exposed interface.
godoc comments make Tom happy.
Rebrand the incorrectly named multiplexer.  It's actually just a fanout.
GoDoc comments for the OutputDrivers.
GoDoc.
Fix potential error with sending outputs before attaching drivers.