Note that this patch must stay until the end of stage 1.

buildbot problem partially solved: sys.maxint is now also hacked when called by the buildbot (which uses pytest, not the test_all

We should discuss on irc whether it's a good idea or not.
Most importantly, this doesn't seem to work on Python 2.5,
which I find to be still an important platform.

which had prolonged some pypy test runs (app-level most notably)

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.

and some initial tweeks to conftest.py