Testoob running on IronPython

[orip]

Testoob now runs its own test suite (unit tests and system tests) on
IronPython 1.1.2 and 2.0rc1.

Some of tests are even passing :)

This means that the basic functionality works fine, and that some of
the feature are currently implemented with CPython-only capablities
(sys._getframe().f_back, sys.settrace, os.pipe, etc.)

Now it's all a matter of looking at the failures one by one and
finding workarounds, or marking the relevant feature as unavailable on
IronPython, but test suites can already be run on IronPython with
Testoob.

orip