Patch #6210. Reviewed by John Darrington.

Patch #6210.  Reviewed by John Darrington.

* command-line.c (parse_command_line): Don't call force_long_view,
as that function is no longer necessary.

* msg-ui.c (handle_msg): Only wrap message output to the message
file to the width of the terminal if the message file is a tty.

* settings.c: Drop "long view", which is not needed any longer.
(static var long_view): Removed.
(force_long_view): Removed.
(get_viewwidth): Removed.
(init_viewport): Removed long_view reference.