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gets the self-reported version number of the executable.

=item * C<$Alien::Gnuplot::pl> 

gets the self-reported patch level.

=item * C<@Alien::Gnuplot::terms> 

gets a list of the names of all supported terminal devices.

=item * C<%Alien::Gnuplot::terms> 

gets a key for each supported terminal device; values are the 1-line
description from gnuplot.  This is useful for testing whether a
particular terminal is supported.

=item * C<@Alien::Gnuplot::colors> 

gets a list of the names of all named colors recognized by this gnuplot.

=item * C<%Alien::Gnuplot::colors> 

gets a key for each named color; values are the C<#RRGGBB> form of the color.
This is useful for decoding colors, or for checking whether a particular color
name is recognized.  All the color names are lowercase alphanumeric.

=back

You can point Alien::Gnuplot to a particular path for gnuplot, by
setting the environment variable GNUPLOT_BINARY to the path.  Otherwise
your path will be searched (using File::Spec) for the executable file.

If there is no executable application in your path or in the location
pointed to by GNUPLOT_BINARY, then the module throws an exception.
You can also verify that it has not completed successfully, by
examining $Alien::Gnuplot::version, which is undefined in case of
failure and contains the gnuplot version string on success.

If you think the global state of the gnuplot executable may have
changed, you can either reload the module or explicitly call
C<Alien::Gnuplot::load_gnuplot()> to force a fresh inspection of
the executable.

=head1 INSTALLATION STRATEGY

When you install Alien::Gnuplot, it checks that gnuplot itself is
installed as well.  If it is not, then Alien::Gnuplot attempts to 
use one of several common package managers to install gnuplot for you.
If it can't find one of those, if dies (and refuses to install), printing
a friendly message about how to get gnuplot before throwing an error.

In principle, gnuplot could be automagically downloaded and built, 
but it is distributed via Sourceforge -- which obfuscates interior
links, making such tools surprisingly difficult to write.

=head1 CROSS-PLATFORM BEHAVIOR

On POSIX systems, including Linux and MacOS, Alien::Gnuplot uses
fork/exec to invoke the gnuplot executable and asynchronously monitor
it for hangs.  Microsoft Windows process control is more difficult, so
if $^O contains "MSWin32", a simpler system call is used, that is
riskier -- it involves waiting for the unknown executable to complete.

=head1 REPOSITORIES

Gnuplot's main home page is at L<https://gnuplot.sourceforge.net/>.

Alien::Gnuplot development is at L<https://github.com/drzowie/Alien-Gnuplot>.

A major client module for Alien::Gnuplot is PDL::Graphics::Gnuplot, which
can be found at L<https://github.com/PDLPorters/PDL-Graphics-Gnuplot>.
PDL is at L<https://pdl.perl.org/>.

=head1 AUTHOR

Craig DeForest <craig@deforest.org>

(with special thanks to Chris Marshall, Juergen Mueck, and
Sisyphus for testing and debugging on the Microsoft platform)

=head1 COPYRIGHT AND LICENSE

Copyright (C) 2013 Craig DeForest

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut