Message1056

I found that the current CVS version of Jython misses
the itertools package (which CPython implements in C),
so I grabbed the descriptive implementation from the
CPython 2.4.2 documentation and put it into a module. I
does not completely work, but it rather seems to
trigger bugs in Jython than in the module (I filed a
bug report on that, too). I couldn't run the CPython
test suite on it because of problems with Jython
startup and the CPython 2.4 stdlib (site.py doesn't
load correctly), so I can't be sure everything works.
The module misses the implementation of 'tee()', which
isn't complete in the docs (but which was only added in
2.4, so there shouldn'd be much code that relies on it).