* Revert revert r39662 of my parser changes.

* Revert revert r39662 of my parser changes.
* Fixed image link whitespace handling (Brion's complaint, r39662)
* Added fuzz test capability to parserTests.php
* Added __destruct() functions to Parser and Language, and called them explicitly from parserTests.inc, to avoid unconstrained memory usage during fuzz testing.
* Added unified diff to output of Parser_DiffTest
* Fixed whitespace change in Parser::doTableStuff() (found by fuzzing)
* Added feature to RELEASE-NOTES which I'd committed last time but forgotten to note: <gallery> will accept image names with no "Image:" prefix (rediscovered by fuzzing)
* Limit memory usage in Title::getInterwikiLink()
* Fixed chronic fail of all interwiki link parser tests (hid Siebrand's complaint, r39464)
* Fixed chronic fail of one of the LanguageConverter parser tests. Was actually an ignored bug.