Upgrade license to GNU General Public License version 3 or later
Even though the individual source files in this repository are under GNU General Public License version 2 or later, the final binaries were being implicitly upgraded to version 3 or later of the license by virtue of linking against libraries like Babl and GEGL that are under GNU Lesser General Public License version 3 or later. Since GPLv2 does not permit combinations with LGPLv3, the only way to distribute the combined work was under GPLv3+. See: https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility Let's clarify this by explicitly stating that this project is under GPLv3+ instead of pushing the burden of understanding how the code is linked together, and the licenses involved, on individual distributors.
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