remove SoundTest and JUnit

This was part of the license audit. Because SoundTest isn't actually
_used_ anywhere in JES, and because it's not a very good test case
anyway, I decided to delete it so the JUnit JAR could be removed as
well, thus reducing the number of licenses present in our source code.
audit and add third-party licensing inforamtion

This lives in a JESDependencies.txt file, which includes a list of
all the third-party components in JES with the attendant licenses.

Fortunately, all our code is legally redistributable (though I have to
admit that jmf.jar made me a nervous), but some of the licensing and
versioning information isn't 100% clear, and I had to make
some inferences.