MediaWiki 1.20

This is the latest alpha version of MediaWiki.

Starting in April 2012, the Wikimedia Foundation started deploying MediaWiki to its projects more often (and almost directly from the master branch) through incremental "wmf"-branches within the 1.20 release cycle. The 1.20.0 stable tarball is expected to come out in summer or fall of 2012 (but one can also stay current on the bleeding-edge through git master).

What's new?
The MediaWiki 1.20 release will bundle all the changes included in the smaller, semi-monthly 1.20wmfX software deployments to Wikimedia sites:
 * MediaWiki 1.20/wmf10 - Deployed in 20 August - 29 August 2012
 * MediaWiki 1.20/wmf9 - Deployed in 6 August - 15 August 2012
 * MediaWiki 1.20/wmf8 - Deployed in 23 July - 1 August 2012
 * MediaWiki 1.20/wmf7 - Deployed in 9-18 July 2012
 * MediaWiki 1.20/wmf6 - Deployed in 25 June - 4 July 2012
 * MediaWiki 1.20/wmf5 - Deployed in 11-20 June 2012
 * MediaWiki 1.20/wmf4 - Deployed in 28 May - 6 June 2012
 * MediaWiki 1.20/wmf3 - Deployed in 14-23 May 2012
 * MediaWiki 1.20/wmf2 - Deployed in May 2012
 * MediaWiki 1.20/wmf1 - (see overview of changes)

In particular:
 * New diff view, greatly improved in clarity especially for whitespace and other small changes and colour-blind users.
 * Minimum PHP version is now 5.3.2.