Fix Skipping behat tests.
Updates to the docs to mention the MathJax filter in Moodle 2.7.
Better documentation for the option "Insert *s assuming single character variable names."
Minor updates to the docs.
Fix bug in, and change the behaviour of, ATCASEqual.  Now we assume simp:false.
Instant valdation was not working for single-char inputs.
If we are editing the General Feedback from a question it is very helpful to see the question text on the same page in the caschat script.
Merge branch 'master' of github.com:maths/moodle-qtype_stack
Fix to issue #103:  Minor bug in the question tests.
Fix to issue #104: Impossible to store "null" scores or penalties as test case outcomes.
Fix #102 new capability to control access to the authoring tools.

That is, the cas chat script, and the answer tests, etc.
Additional test cases.
Add support for more AMS mathematics environments, including `\begin{align}...\end{align}`, `\begin{align*}...\end{align*}` etc.
Fix qtype/stack:usediagnostictools capability.
Merge branch 'master' of https://github.com/maths/moodle-qtype_stack
Merge the auto optimize Maxima into the main branch.
Separate test classes into different files.
Failing unit tests for this bug.
Separate unit test classes into different files.
Split all other cases of two tests in the same file.