bug#13602: 24.3.50; remove bindings for `icomplete-minibuffer-map' - make a separate mode

[Drew Adams]

> > I for one just disabled `icomplete-mode' in ~/.emacs when it got
> > added ido keybindings, waiting in the hope that someone 
> > will implement `icomplete-mode-without-ido-keybindings' :-)
> 
> (setq icomplete-minibuffer-map (make-sparse-keymap))
> should do it.

Here's the point: Users should not have to do that.

Give them a simple toggle command, so they don't need to know Lisp and dig into
the Icomplete or other code to figure that out and fix things.

And please turn off the bindings by default.

What's the big deal?  This should be a no-brainer.