Also move the maintenane script to a name that makes
MediaWiki.Files.ClassMatchesFilename.NotMatch not error,
and use the more restrictive licence tag usage for
MediaWiki.Commenting.LicenseComment.InvalidLicenseTag.
Change-Id: Ifa5518cd590ae83c6fd76f1dbb5a2ce40de4b119
Principal code is in includes/*.php with the file named the same as the class it
contains. The maintenance script is moved to maintenance/ for clarity.
Change-Id: Icb4cdffb1bd4716e14f883d667def96671b42992