parserTests.php: fix three bitrot bugs with --record

parserTests.php: fix three bitrot bugs with --record

* Add a subtest index to the recorded test name, to avoid an SQL
  duplicate key error.
* Introduce TestFileDataProvider. Previously, the order of named
  parameters in TestFileIterator was relevant but undocumented, so
  adding a subtest parameter broke phpunit tests.
* Don't implicitly commit (commitMasterChanges) an explicit transaction,
  since that now causes a fatal error.
* Reset namespace cache as in NewParserTest.php, so that the MemoryAlpha
  article insertion doesn't fail. This was only visible with --record
  because the namespace cache is initialised by
  SpecialVersion::getVersion() during recorder setup.

Change-Id: Ied4636b4acbf1d268e45901fed4d4e077b5ed666