This is closely modelled to the OpenBLAS easyconfig, in that it allows OpenMP threading, auto-detects the CPU on the build host, and enables shared libraries.

BLIS is relevant esp as an open source solution on Skylake since OpenBLAS is still about 2-3 times slower than MKL on large matrix multiplications -- apparently BLIS is much closer.

It does not include LAPACK however, so that will need a seperate easyconfig.

Test report by @pescobar
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
worker01.cluster.bc2.ch - Linux centos linux 7.3.1611, Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz, Python 2.7.5
See https://gist.github.com/1c524c431bfc2d73328c2aca7876868a for a full test report.

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
node3110.skitty.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz, Python 2.7.5
See https://gist.github.com/c88d274feecc852414e3115bd9928a7e for a full test report.

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
node2083.delcatty.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, Python 2.7.5
See https://gist.github.com/3b365ab25e50fa81661eecfa2062be2c for a full test report.

Test report by @boegel
SUCCESS
Build succeeded for 2 out of 2 (1 easyconfigs in this PR)
node2565.golett.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz, Python 2.7.5
See https://gist.github.com/79a1ebbb008ec824023357d4fee1a3b6 for a full test report.

Going in, thanks @bartoldeman!