* Introduce $wgCanonicalServer, which should typically be a fully qualified version of $wgServer but in practice can be anything that you'd like to be used in IRC/e-mail notifs
** Default value is $wgServer, expanded to http:// if protocol-relative
** This means you can easily set HTTPS as the 'default' protocol to use in IRC and e-mail notifs by setting $wgCanonicalServer to https://example.com
* Introduce Title::getCanonicalURL(). Similar to getInternalURL(), including a hook for WMF usage (which will be needed as long as secure.wikimedia.org is used)
** Also add escapeCanonicalURL(). Due to some ridiculous accident of history, the other escapeFooURL() functions don't have a $variant parameter; I decided not to follow that bad example
* Reinstate the spirit of r44406 and r44412: instead of calling getInternalURL() (or getCanonicalURL()) and regexing the title parameter out, obtain the path to index.php using $wgCanonicalServer . $wgScript and append params to that. Sadly, we need to add a hook here to support the secure server hack for WMF, but that's the price of saner code in this case
* Introduce the {{canonicalurl:}} and {{canonicalurle:}} parser functions, which work just like {{fullurl:}} and {{fullurle:}} except that they use getCanonicalURL() instead of getFullURL()
* Use {{canonicalurl:}} in the enotif_body message, fixing bug 29993 (protocol-relative URLs appear in e-mail notifications)
Also make a few changes to the functions available. SpecialPageFactory::resolveAlias() now takes an optional subpage and returns array(<name>,<subpage>). Similarly merge getPage() and getPageByAlias(). There were many examples of (extensions particularly) making dubious assumptions about the presence or absence of subpages or canonical-ness.
I didn't deprecate SpecialPage::getTitleFor() as it's got over six hundred calls. I'm rather undecided on the best position of getPage()/executePath(). Although the latter needs cleanup anyway.
* MessageCache::singleton() calls wfGetMessageCacheStorage() directly instead of using $messageMemc, just in case this would be called before that variable is set
* Per TimStarling: also removed deprecated methods in MessageCache class: addMessages() and related, [get|set|enable|disable]Transform(), loadAllMessages(), loadMessageFile() and some others. Same for the legacyData stuff in LocalisationCache that was only used by MessageCache::addMessages() and related.
* Converted remaining extensions
* Removed other usages of $wgUser in Parser stuff, as stated in doc
* Added mechanism to get an User object in Parser, based either on the object given in Paser::preSaveTransform() or the ParserOptions otherwise
** DISPLAYTITLE now parses the single-quote items of wiki markup (bold and italic).
** Remove UNIQ markers from the output due to people putting tags in there (nowiki, ref, etc.).
** Forbid hr and br elements from being in DISPLAYTITLE as well.
