epl: Duplicated Frames

  Remake of the duplicated frames filter with
  less memory usage.

Change-Id: I7c8694b5ae69c919b866bbc661bad5e3f0a3e1d7
Reviewed-on: https://code.wireshark.org/review/4773
Reviewed-by: Roland Knall <rknall@gmail.com>
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Lukas Emersberger <lukas.emersberger@gmail.com>
Reviewed-by: Michael Mann <mmann78@netscape.net>