The attached patch (against recent HEAD) adds a new option
`--frame-parameters' to emacsclient, which allows to set the frame
parameter alist for the to-be-created frame.

This feature is useful for window managers that allow matching on X
properties. Without this patch, it is not possible to influence those
at /frame creation time/, they could only be set after the frame was
already created. This is to late for windowmanagers who match, and
typically do so at frame creation time.