* Stabilise timestamps generated by the parser to avoid diff test false positives
* Fixed msgnw bug. Use RECOVER_ORIG.
* Fixed editintro bug. Cloning the parser in MessageCache has some side-effects that need to be corrected.
* Fixed typo in Parser_DiffTest.php
* General improvements to preprocessorFuzzTest.php
* Fixed breakage of XML output feature in Special:ExpandTemplates
* Added template recursion depth limit. It needs a small limit, because of exorbitant stack space usage, xdebug compatibility problems, and the potential for O(N^2) memory usage in the template loop check.
* Made these two error messages more obvious in the parser output, with <span class="error"> instead of a comment. This is similar to the #expr error messages, which seem to have been well received by our template programmer community.
* Made it possible to configure the parser class being used, via $wgParserConf.
* Moved defines from the top of Parser.php to either class constants or Defines.php
* Added Parser_DiffTest, a differential parser class for regression testing
* Added Parser_OldPP, a parser class which operates like the parser before this commit. I made one breaking change: a bugfix to avoid losing whitespace when adding MWTEMPLATESECTION markers.
* Made internal tidy work with PHP 5
* Added the ability to supply a hook for template fetching via ParserOptions. This is handy for testing.
* Updated parserTests.txt to account for the various breaking changes I made. Removed a few parser tests that no longer test for anything useful.
* Add @addtogroup tags to various classes, to try and group conceptually-related classes together.
* Add brief descriptions to various Special pages, thanks to Phil Boswell.
* Moving some docs to be right above the classes they represent, so that they are picked up.
* Convert "$dbw =& wfGetDB( DB_MASTER );" --> "$dbw = wfGetDB( DB_MASTER );"
* convert "$skin =& $wgUser->getSkin();" --> "$skin = $wgUser->getSkin();"
For the time being have not changed the function definitions of wfGetDB() or User::getSkin() [i.e. they are still both return-by-ref], so as to ensure the interface does not change for extensions [some of which may still be trying to run on PHP4 environments]. However presumably at some point this can be changed too.
Also includes tiny tweak to newlines in parserTests - will show 1 rather than 2 newlines between the "Reading tests from" strings when in quiet mode.
