https://wiki.creativecommons.org/wiki/License_versions
https://wiki.creativecommons.org/wiki/Frequently_Asked_Questions#Why_should_I_use_the_latest_version_of_the_Creative_Commons_licenses.3F

This adds a license chooser to the installer. The installer defaults to
the more free CC-BY-SA. CC-NC-BY-SA is still the default in dokuwiki.php
to keep backwards compatibility.

The license array was reordered and Non-Derivative licenses removed
(they don't make much sense for wiki content).

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