* Factored out PPD "part" handling into its own class. Verified with differential...

* Factored out PPD "part" handling into its own class. Verified with differential fuzz test.
* 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