Log Message:
Update to 5.1:

  v5.1  The bitmap graphics from the US Macintosh release of Lancelot
        now display correctly.

  v5.0  V1 games are also now supported.
        The input logic now correctly handles commas and full stops
        in the user's input for v3 or later games.
        The input logic now allows hyphens and apostrophes to be
        input, which is needed for some v2 games.
        The dictionary listing for v2 games no longer has junk on the
        end.
        The graphics detection algorithm has been improved, so that it
        now correctly finds graphics in all known games.
        A difference in the logic between the v2 and v3 line-drawn
        graphics has been implemented, which corrects the scaling for
        some v2 graphics.
        Added #seed and #play meta commands.

  v4.1  Corrected a bug that made Lancelot unplayable.
        BBC B bitmaps are now shown as they appeared on the original
        computer.