Apache and WSGI dont't work with SciPy

We discovered that after last installations/upgrades of our platform using the production stack (apache + wsgi) page loading take forever causing a timeout.
Platform works using Nginx + uWSGI.

After some investigation we discovered that this issue is caused by WSGI used with SciPy (which has been added recently by the vulnerability app).

This issue can be fixed adding a directive to Apache conf:

WSGIApplicationGroup %{GLOBAL}

See https://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API for details

We need to test that everything works and performance are not impacted by the new directive.