Michael Sternberg 726c7e0f06 Opt avx (#7486) ...

* Promote to Autotools for simplicity; broaden Intel CPU opt targeting from SSE4.2 to AVX2

* make Intel CPU opt targeting same as in ../libxc

* flake8 W291

* use canonical means to pass (ahem) the test phase, h/t @adamjstewart

* revert f25d598 (unrelated merge)

* re-merge

2018-03-21 19:53:19 -05:00

..

spack

Opt avx (#7486)

2018-03-21 19:53:19 -05:00