Fix mismatch in how Gnuplot is found during configure and runtime #97
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This adds
Alien::Gnuplot
as a configure-time dependency so that itfinds the
gnuplot
binary the same way at configure-time that italready does at runtime. Since
Alien::Gnuplot
already checks for aworking Gnuplot,
Makefile.PL
does not need to do this.This allows for overriding via the
GNUPLOT_BINARY
environment variable(e.g., for testing multiple versions of Gnuplot).
Fixes #92.