Long-overdue commit

awlc-algebra and awlc-statistics:

* New symbols and acronyms
* Minor modifications to MathOperators in -statistics.

drangreport:

* Prep for OpenDyslexic work
* Upright header text (previously italics)

drangsymbols:

* Modifications to spacing of several maths-statement environments
* Modifications to cover text for lecture notes
* New commands