MediaWiki 1.22/wmf2

The latest version (labeled "1.22wmf2") of MediaWiki, the software that powers Wikipedia and its sister sites, is being deployed to all Wikimedia sites in stages, starting on Monday, 15 April 2013 (see the roadmap).

Most important changes

 * The following old skins with minimal usage have been removed: Standard, Simple, Chick, MySkin and Nostalgia. Nostalgia remains available as an extension for posterity. More information at Turning off outdated skins.
 * Diff on mobile version will now be color-blindness friendly (for protanopia and deuteranopia), with margin right for single characters and new colors for insertion and removal replacing the old ones for insertion and removal.
 * - API: Fix rccontinue handling
 * - API: Fix sorting for iwlinks, langlinks