make tests print to JES stderr

The TextTestRunner captures stderr when it's created, and as a result,
the "stderr" it has when it's initialized has disappeared by the time
the tests actually run. So, a special stream is created in
TestExecute.py that always passes writes to the current sys.stderr.
add myself to JESCopyright.txt

5.0 alpha isn't _quite_ out yet, but all the features in it are done,
so that's close enough.