(multi-query-replace-map): New variable.

(multi-query-replace-map): New variable.
(perform-replace): Add processing of new multi-buffer keys bound
to `automatic-all' and `exit-current'.  Set `query-flag' to nil
if last input char was `automatic-all'.  Set new local variable
`multi-buffer' to t when one of new two keys were typed.  Return
non-nil value of `multi-buffer' that tells to calling functions
to continue replacement on the next file.