Rework recent image-multi-frame stuff a little
* image.el (image-current-frame): Change from variable to function. (image-show-frame): Rename from image-nth-frame. Update callers. * image-mode.el (image-multi-frame): New variable. (image-mode-map, image-mode, image-goto-frame): Use image-multi-frame rather than image-current-frame. (image-mode, image-goto-frame): Use image-current-frame as function rather than as variable.
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