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* licenses: Add CC-BY-4.0; replace CC-BY-SA-4.0 by the official version.Ulrich Müller2015-09-261-0/+393
Official plaintext versions of the CC licenses taken from: https://creativecommons.org/licenses/by/4.0/legalcode.txt https://creativecommons.org/licenses/by-sa/4.0/legalcode.txt