plotutils changed license from GPLv2+ to GPLv3+ (mostly)

[Stanislav Ochotnicky]

This change actually happened in 2008 (jikes), but we seemed to have missed it.

Most of code is now GPLv3+, except libxmi which stayed on GPLv2+. No package
seems to BR plotutils so I assume there are no licensing conflicts.


-- 
Stanislav Ochotnicky <sochotnicky at redhat.com>
Software Engineer - Base Operating Systems Brno

PGP: 7B087241
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