Adding tests derived from the Jython project. These are primarily tests of

Adding tests derived from the Jython project.  These are primarily tests of
'single' statements with partial sentences (so they test things like "try:" in
interactive mode).  Others tests hit areas that previously failed in Jython. A
couple still fail in Jython, mainly due to the difficulty of parsing partial
sentences (but should be fixed by Jython 2.6).