* main.c: Remove unused terminating_signals and catch_termination().

    * main.c: Remove unused terminating_signals and catch_termination().
        (long_options):  Terminate with a zero element.
        [Bugfix from Atsuo Kawaguchi <atsuo@hark86.harl.hitachi.co.jp>.]
        (gdb_readline):  Make call-compatible with readline.
        (init_signals):  Improve comments re vfork vs. signal.

        * utils.c (prompt_for_continue):  Use new gdb_readline().
        If we prompt for continuation, we don't let CR repeat the previous
        command, once we get back to a prompt.  It's too easy to keep
        hitting CR, expecting "--more--" prompts, and have some long
        command start repeating on you.