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Provide ability for third-party plugins that aren't "GPL v3 or later" (i.e., not 100% compatible with Piwik's license) to display their license (and link to full license text) in a conspicuous location (e.g., in the plugin description area).
(In ) fixes #1805 - add optional license and license_homepage to Plugin's getInformation(); expand Proxy redirect whitelist of URLs
(In ) refs #1805