Add behat tests for qtype pmatch #11861
Remove add_to_log from qtype_pmatch. #11861
qtype_pmatchjme problems re-loading the editing form. #12212

* Any other answer -> Atom count feedback, if you tick that field,
save the question, then re-edit it, that field becomes unticked.

* It always adds space for an extra answer when you re-display the
form.
Pattern-match question type: impossible to remove answers.

It was not possible to remove extra unwanted answer matching rules when
editing quesitons. The added code is the same as found in many other
quesiton types, but was missed here.