It was due to the fact the default mode was made non deterministic in 86cac3aa7744

This is especially important under Windows, where one cannot overwrite a
library currently in use.

* * *
new op: Cond
* * *
gpu lazycond optimization

* * *
added profile param support to function
* * *
added profile param support to pfunc
* * *
profile argument support in DebugMode

Also removed some unused duplicated code.

Fixed script run_tests_in_batch so that it works even when the 'nosetests' command cannot be directly called from subprocess.

This happens for instance on Windows when nosetests was installed within MinGW with "python setup.py install".