Enable STACK's plot command to plot "discrete" and "parametric" plots.
Refactoring the plot command to deal with options.  Alt next must now be specified as [alt,"Time"] not as an equation.
Basic support for options in the plot command.  Not all options added, and some (e.g. axes) may not work in Maxima (never mind in STACK).  It is a start, and a significant improvement.
Merge branch 'master' of github.com:maths/moodle-qtype_stack
Better outcomes from the answertests testing script.
Improve styling of answer test expected failures.
Fix deprecated function warning with latest Moodle.
Enable a function as an answer type, e.g. improve validation.  Rudimentary support only.
Merge branch 'master' of github.com:maths/moodle-qtype_stack
Suggested patch to core_component::get_plugin_list_with_file
Tidy up previous commit.
Adding in further options to plot.
Update keyword lists for Maxima 5.30.0.
Code tidy.
Added a new feature for inputs to enable teachers to "allow" function names with more than 2 characters for some inputs in a question.
Update the publications etc.
Support added for Maxima 5.31.1.
Fix docs example when using Moodle maths filters.

Maths inside <textarea>s (which are used to make the example content
easy to copy-and-paste) were having the maths processed by the filters,
which made them useless to copy and paste. Fixed now.
Some test cases involving inf added.
Merge branch 'master' of github.com:maths/moodle-qtype_stack