Possible issue: MKL + NumPy + NumExpr interference

[kif]

A warning message about known interference of intel performance libraries (MKL, TBB, VML,...) with numpy and numexpr, two python libraries heavily used in pyFAI. This is more prone to affect users of the anaconda python distribution since it ships by default MKL and other performance libraries.

Several bugs were reported:

• Multithreaded ne.evaluate() intermittently returns all-zero output on Windows / I7 14700K CPU (reproduces 2016 SO #36484326) pydata/numexpr#557
• Numexpr + MKL does bad maths pydata/numexpr#522

If pyFAI is randomly crashing or giving completely stupid results, please report it in this discussion.

You can also pass the "internal tests" by running:
python -c "import pyFAI.test; pyFAI.test.run_tests()"
and report here the number of errors and the type of errors.

Normal output should end like this (preceded by tons of warnings):

........
----------------------------------------------------------------------
Ran 601 tests in 281.613s

OK (skipped=2)
Test suite succeeded

Thanks