[Groff] grn update

[Daniel Senderowicz]

Hi guys,

Below you'll find a patch for grn. As in the original Berkeley GRN,
groff-grn now understands and plots both interpolated curves and
B-splines as generated by gremlin. Bezier curves will be plotted
as B-splines. This context difference file has been generated from
the groff-current sources. Perhaps someone can try it out and let
me know if there is any problem.

Cheers,

Dan

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`
end