Merge pull request #733 from davide125/namespaces

ExampleData: update copyright byline for Namespaces.xml

mathics/data/ExampleData/copyright.csv

@@ -12,6 +12,6 @@ numberdata.csv	GNU Free Documentation License 1.2	Own Work	Created By Angus Grif
 colors.json	GNU Free Documentation License 1.2	Own Work	Created Manually By Angus Griffith 
 Testosterone.svg	Public Domain	http://en.wikipedia.org/wiki/File:Testosteron.svg	Taken from http://en.wikipedia.org/wiki/Testosterone on 2013/03/03
 InventionNo1.xml	GNU Free Documentation License	http://openmusicscore.org/index.php?option=com_content&view=article&id=125:invention-no-1-bwv-772-bach-johann-sebastian&catid=84&Itemid=531
-Namespaces.xml	CC BY-NC-SA License	http://edutechwiki.unige.ch/en/XML_namespace	"A larger example of namespace scoping" with comments removed
+Namespaces.xml	W3C License	https://www.w3.org/TR/REC-xml-names/#defaulting	"A larger example of namespace scoping" with comments removed
 Middlemarch.txt The Project Gutenberg License   https://archive.org/details/middlemarch00145gut Chapter 75 of George Eliot's novel Middlemarch in ISO Latin 1 (8859-1) encoding
 PrimeMeridian.html CC-BY-SA and GFDL    https://en.wikipedia.org/wiki/Prime_meridian    HTML of the English Wikipedia entry for "Prime Meridian" as of 2016/11/02; also see https://en.wikipedia.org/wiki/Wikipedia:Reusing_Wikipedia_content