* Defer loading the bulk of the code until a parser function is actually called. Necessary due to the recent large increase in code size.
* Fixed the total disregard for parser state and object-oriented data flow in ExtParserFunctions::loadRegex().
Uses $dir in extension files, and assumes that it remains unchanged in require_once( 'maintenance/commandLine.inc' ).
In fact, it is likely that '$dir' will be set when setting up command-line, as some extensions will use the same var.
Recommended fix: Use $CentralAuth_dir, $EmailPage_dir, etc.
Uses DateTime class in PHP 5.2+ to support dates outside the 1970-2038 range. On earlier versions will still fall back to strtotime with the old 32-bit Unix timestamp range limitations.
Patch by rememberthedot -- https://bugzilla.wikimedia.org/attachment.cgi?id=5416
Added a couple quick parser test cases to confirm the new behavior. However I am seeing some annoyances with how input time zones are handled, so we'll want to clean that up at some point. :)
Causes regression for titles containing "+".
Proper fix here is to move the existing % decoding into Title::newFromText or Title::secureAndSplit so it's done automatically, rather than attempting to replicate it, with the potential of getting it wrong like this, every place we decide to accept titles
* Reduced stack depth by using an internal stack in expand(), and by having some common code paths (e.g. non-subst double-brace during PST) return objects which can be expanded in that internal stack instead of the PHP stack. This is friendly to xdebug but slightly slower than the original version. Also it probably helps robustness when you don't add 7 stack levels per pair of double braces.
* Profiling indicates that expand and PPD are now good targets for porting to C. Abstracted and refactored the relevant code to allow for a drop-in replacement. A factor of 2 reduction in average-case replaceVariables() time may be possible.
* Verified with preprocessorFuzzTest.php against r29950, updated to allow better PST tests.
* Made parserTests.php respect $wgParserConf
* LST and ParserFunctions need a simultaneous update with the core due to changed interfaces. DOM objects are now wrapped rather than directly exposed.
* remove some unneeded blackslashes in messages (caused malformed error message)
* put Magic in separate file
* delay message loading
* add version in extension credits, remove EOL whitespace
* update Translate extension
** Move error messages to ParserFunctions.i18n.php
** Rename 'expr_...' to 'pfunc_expr_...' to be consistent with other messages which are localizable already
* Add CSS class 'error' to output of error messages
