* remote.c (remote_interrupt): Rewrite to use remote_stop.

    * remote.c (remote_interrupt): Rewrite to use remote_stop.
        (remote_interrupt_twice): Remove. remote_stop now handles it.
        (remote_stop): New function which handles interrupting the
        remote target so that CLUI and GUI use the same core functions
        to achieve the same goal.
        (remote_wait): Change to handle remote_stop properly.
        [interrupted_already]: New static global to help remote_stop.
        [remote_ops, extended_remote_ops]: Add remote_stop for to_stop member.

        * target.c: Rename static function "ignore" to "target_ignore" and
        export it so that gdb can determin if some target vector member is
        actually not defined. Replace all occurances of ignore.

        * target.h: Export target_ignore.