Added gUnit to standard libraries.

Added pre-compiled gUnit to libraries.
Also modified stub version of mgcollections.  This is now compatible
with mgcollections when using the C backend, but doesn't compile
under the JS backend because of a bug therein.
Finished making gUnit pre-compiled.

Also changedthe case of generated Module<name> so that
it is the same as in the C backend, even though that's wrong.