[RFA/commit/doco] move handing of "set interactive-mode" to gdb_has_a_terminal

[Eli Zaretskii]

> From: Joel Brobecker <brobecker@adacore.com>
> Cc: Joel Brobecker <brobecker@adacore.com>
> Date: Tue, 18 Jan 2011 18:42:21 -0500
> 
> I feel that the name of the setting isn't great, and I've been trying
> to find better names, but not much luck (the best I have, I feel, is
> "set/show terminal-mode [on|off|auto]).

I see nothing wrong with "set interactive-mode", maybe because I'm
accustomed to this term in Emacs.

> This patch also adjust the command help and the associated section in
> the GDB Manual to be a little clearer about that.

Thanks.

>  If @code{auto} (the default), @value{GDBN} guesses which mode to use,
> -based on whether the debugger was started in a terminal or not.
> +based on standard input settings.

"Based on standard input settings" sounds vague and mysterious.  What
exactly does this mean?

Thanks.