FYI: Single-threading may be needed

[PallHaraldsson]

For Oct2Py at least I got "Session died" (for inv function) and tracked it down to needing:

ENV["OPENBLAS_NUM_THREADS"]="1"

https://github.com/xianyi/OpenBLAS/wiki/faq#multi-threaded

OpenBLAS is ok with threading, but Octave doesn't support the combination, it seems, at least I fixed this way. This needs probably not be reported at Oct2Py, as I think Python doesn't enable threading by default, but Julia does, so for the combination of the three languages is a problem, or I assume would be also for you, this package.