Automate Describer Regression Tests

[TerryHodgson]

Write a script that will run MDE Describer through the example equation sets in doc.

[TerryHodgson]

Need new tests for:
arcsine, arccosine, arctangent, secant, cosecant, cotangent, arcsecant, arccosecant, arccotangent

[TerryHodgson]

DescriberTest.java is a partially completed, but functional, class that automates test runs for the Describer (text description) component of MDE. I did not have time to do the same for the visual graph or sonified graph components of MDE.