* ResourceLoaderFileModule#getAllStyleFiles now returns all style files and all
skin style files used by the module.
* Removed getLang() from IContextSource and subclasses. (deprecated since 1.19)
+* Removed setLang() from subclasses of IContextSource. (deprecated since 1.19)
* Removed WebRequest::escapeAppendQuery(). (deprecated since 1.20)
* Removed info(), purge(), revert() and rollback() from the Article class; they
have since become subclasses of the Action class. (deprecated since 1.19)
* CLDRPluralRuleEvaluator_Range to CLDRPluralRuleEvaluatorRange
* CSSJanus_Tokenizer to CSSJanusTokenizer
* MediaWiki_I18N to MediaWikiI18N
+* Parser_DiffTest to ParserDiffTest
* RevDel_ArchiveItem to RevDelArchiveItem
* RevDel_ArchiveList to RevDelArchiveList
* RevDel_ArchivedFileItem to RevDelArchivedFileItem