Add GPL Cooperation Commitment

[richardfontana]

Red Hat has been leading a campaign to encourage GPLv2 and LGPLv2.x projects to adopt the GPL Cooperation Commitment (GPLCC). GPLCC supplements GPLv2 with the cure and repose provisions of GPLv3. GPLv2 by default features an "automatic termination" provision which is commonly seen as causing immediate termination of the license upon any noncompliance with no opportunity to correct the error. The cure and repose provisions of GPLv3 (1) give first-time violators 30 days to fix noncompliance and (2) automatically restore the license 60 days after the noncompliance stops, if no copyright holder notifies you of the violation during that time period.

We believe GPLCC reduces opportunities for abusive enforcement tactics and promotes greater fairness and predictability in the enforcement of GPLv2 and LGPLv2.x licenses. This commit adds the project version of GPLCC to the repository. It operates prospectively, so it can be adopted by a project even if there are past GPLv2 contributors who have not agreed to it.