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Fix `emacsclient -ne '(+ 2 2)'' (reported by Han Boetes), and clean up some corner cases in Emacs server.

* lib-src/emacsclient.c (decode_options): Make --no-wait imply
  --current-frame, except when it is the only option given.  Make sure no
  frame is opened when --current-frame is set.  
  (main): Pass --current-frame to server.el.

* lisp/server.el (server-process-filter): Handle -current-frame command.
  Don't create frames when it is given.  Don't bind X frames to the
  client when we are in -no-wait mode.

git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-407