remove py/bin/py.test script because we neccessarily have pytest.py at root level anyway.
the root pytest.py is now a modified version of the file from the pytest distribution because I want to disable warnings for people who have installed py.test indepedently from PyPy. Also fix up the docs a bit more to hint / move towards this possibility. also fix the docs to point to "pytest.py" instead of "pypy/test_all.py" which should die at some point.
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