Added -w option to emacsclient for opening a new X frame.

Added -w option to emacsclient for opening a new X frame.

lib-src/emacsclient.c (window_system): New variable.
(frame): Renamed to tty for consistency with the option name.
(longopts, print_help_and_exit): Added -w option. (Suggested by Ami
Fischman <ami at fischman dot org>.
(decode_options): Initialize display to $DISPLAY.  Handle -w option.
(main): Implement the -w option.  Changed to a more elaborate protocol
between Emacs and emacsclient, in preparation to suspend support.

lisp/server.el (server-frames): New variable.
(server-handle-delete-frame): New function.
(server-start): Add it to delete-frame-functions.
(server-select-display): Don't make the new frame invisible.
(server-with-errors-reported): New macro for brevity.
(server-process-filter): Implement the "-window-system" command.
Use server-with-errors-reported.  Fixed regexp for +line:column syntax.
Use the new protocol.

git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-83