Add a formal public-domain dedication so that others can use this.

COPYING

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+                         Creative Commons
+                     Public Domain Dedication
+
+        Copyright-Only Dedication (based on United States law)
+                 or Public Domain Certification
+
+The person or persons who have associated work with this document
+(the "Dedicator" or "Certifier") hereby either (a) certifies that,
+to the best of his knowledge, the work of authorship identified is
+in the public domain of the country from which the work is published,
+or (b) hereby dedicates whatever copyright the dedicators holds in
+the work of authorship identified below (the "Work") to the public
+domain. A certifier, moreover, dedicates any copyright interest he
+may have in the associated work, and for these purposes, is described
+as a "dedicator" below.
+
+A certifier has taken reasonable steps to verify the copyright status
+of this work. Certifier recognizes that his good faith efforts may not
+shield him from liability if in fact the work certified is not in the
+public domain.
+
+Dedicator makes this dedication for the benefit of the public at large
+and to the detriment of the Dedicator's heirs and successors. Dedicator
+intends this dedication to be an overt act of relinquishment in perpetuity
+of all present and future rights under copyright law, whether vested or
+contingent, in the Work. Dedicator understands that such relinquishment
+of all rights includes the relinquishment of all rights to enforce (by
+lawsuit or otherwise) those copyrights in the Work.
+
+Dedicator recognizes that, once placed in the public domain, the Work
+may be freely reproduced, distributed, transmitted, used, modified,
+built upon, or otherwise exploited by anyone for any purpose, commercial
+or non-commercial, and in any way, including by methods that have not yet
+been invented or conceived.