[rfa] add_set_boolean_cmd() with tab expansion

[Andrew Cagney]

> 2001-09-22  Andrew Cagney  <ac131313@redhat.com>
> 
> * cli/cli-decode.c (add_set_boolean_cmd): Define.
> 	* command.h (add_set_boolean_cmd): Declare.
> 	* remote.c (_initialize_remote): Use add_set_boolean_cmd for "set
> 	remotebreak"
> 

As I just discovered, command.h is not the correct place to put 
add_set_boolean_cmd().  Suggestion?  Other than that ok?

Andrew