Check for randeredmatch plugin done using array_key_exists() for PHP4
compatibility
MDL-10317:
Question name is now the question ID, rather than the question text.
Modified check for existence of renderedmatch plugin so that it sees it properly.
Bodged weird parameter passing issue so that correct answer choices are found.
Added Bb Short Response as a Moodle Essay type question.
Found quite a lot of stuff that could do to be checked and improved
in this code, so this should be considered an intermediate step.
