Added test program for mixing ncurses + readline.

  Using readline is trivial if you don't involve curses, and allows
 input to be edited in-place & history navigated too.

  Sadly if you do this inside an ncurses application it fails horribly.

      ./readline curses
  Moved the readline into CScreen.  Display messages.

  The message-display is primitive at the moment, but it
 is a sign of progress.
  Added keybindings for viewing a message.

  In index-mode we can view the currently selected message via
 either SPACE/RETURN.

  We can also move to the next/previous message via "j/k".

  Comment updates too.