this required switching to the generic gemm_beta code (which is faster anyway on SKX)
for both DGEMM and SGEMM

Performance for the not-retuned version is in the 30% range

This patch adds the basic infrastructure for adding the SkylakeX (Intel Skylake server)
target. The SkylakeX target will use the AVX512 (AVX512VL level) instruction set,
which brings 2 basic things:
1) 512 bit wide SIMD (2x width of AVX2)
2) 32 SIMD registers (2x the number on AVX2)

This initial patch only contains a trivial transofrmation of the Haswell SGEMM kernel
to AVX512VL; more will follow later but this patch aims to get the infrastructure
in place for this "later".

Full performance tuning has not been done yet; with more registers and wider SIMD
it's in theory possible to retune the kernels but even without that there's an
interesting enough performance increase (30-40% range) with just this change.

Revert "take out unused variables"

This reverts commit e5752ff9b3.

The variables i and n are used in the `#if !__GLIBC_PREREQ(2, 7)`
branch.

Closes gh-1586.

Fixes from Lapack-Reference PR 253

When minimal workspace is given in ?hesv_aa, ?sysv_aa, ?hesv_aa_2stage, ?sysv_aa_2stage, now no error is given
Quick return for ?laqr1

LAPACKE interfaces for Aasen's functions now call ?sytrf_aa and ?hetrf_aa instead of ?sytrf and ?hetrf

Work around name clash with Windows10's winnt.h

Handle INCX=0,INCY=0 case

Update version number on the develop branch to 0.3.1.dev

Fix paths to LIN and EIG tests

fixes #1503

Fixes #1575 (sswap/dswap failing the swap utest on x86) as suggested by atsampson.

should fix 1574

Adapt lapack-test and blas-test to changes in netlib directory layout

partial fix for #1574 - the problem with lapack_testing.py looks like an upstream bug

Conflicts:
	exports/Makefile

Use the new zrot.c on POWER8 for crot as well

fixes #1571 (the old zrot.S assembly does not handle incx=0 correctly)

Revert " Switch mips32 target to USE_TRMM to fix complex TRMM"

... as it was just a silly workaround for the issue seen in #1563, caused by #1419

Remove extraneous brace from previous commit of mips dsdot fix

Revert changes from PR#1419

at least one of these changes apparently is an oversimplification, leading to TRMM breakage on some platforms as observed in #1563

Use correct data type for initializers of v2f64, v4f32

Fixes #1561

Add build-time configuration options to pkgconfig file

Overwrite any pre-existing openblas.pc rather than append to it

Add threading and OpenMP information to output

For #1416 and #1529, more information about the options OpenBLAS was built with is needed. Additionally we may want to add this data to the openblas.pc file (but not all projects use pkgconfig, and as far as I am aware the cmake module for accessing it does not make such "private" declarations available)

move _Atomic define to common.h