[MI] -thread-select using the --thread option

[Marc Khouzam]

> 
> > Whenever I use an MI command I use --thread instead of 
> -thread-select,
> > but when I have to use a CLI command I have to use -thread-select.
> 
> Why? I though that:
> 
> 	-interpreter-exec --thread 1 "cli" "the command"
> 
> should work just fine.

You're right.  I have an outstanding bug to use that format instead.
I had forgotten about it :-O

Thanks