on-new-image-snip

Creates and returns a new instance of image-snip% for insert-image.

• (send an-editor on-new-image-snip filename kind relative-path? inline?) -> image-snip% object
      filename : string or #f
      kind : symbol in '(unknown gif xbm xpm bmp pict)
      relative-path? : boolean
      inline? : boolean

  Returns (make-object image-snip% filename kind reltaive-path? inline?).