bug#25005: 25.1; Support disabling bracketed paste mode.

[Eli Zaretskii]

> From: Jay Lee <jay@hanjaelee.com>
> Date: Wed, 23 Nov 2016 23:47:37 +0900
> 
> I see that bracketed paste mode is automatically enabled in emacs 25.1 
> running in terminal.
> I know this mode is very good at security. But while I’m editing text, this 
> mode annoy me. because something
> text is added.
> ex) 200~hello, world201~

That sounds like some bug, so please provide a recipe, preferably
starting from "emacs -Q".

Also, I suggest to try the current emacs-25 branch, I think there were
some improvements in that area since 25.1 was released.

> There is no problem in emacs -q session. I think that bracketed paste mode is 
> not enabled in this case

I think it is enabled in "emacs -Q" as well.  So the fact it only
happens with your customizations would suggest that some of those
customizations might interfere with bracketed paste.