MIPS threading fixes

Fixes to driver/others/memory.c

MIPS 32-bit currently has an empty blas_lock implementation which is
worse than nothing at all. MIPS 64-bit does has a blas_lock
implementation but is broken. Remove them and fallback to the generic
version in common.h which should do the right thing on MIPS.

The MIPS architecture has weak memory ordering and therefore requires
sutible memory barriers when doing lock free programming with multiple
threads (just like ARM does). This commit implements those barriers for
MIPS and MIPS64 using GCC bultins which is probably easiest way.

Before this commit, the "position < NUM_BUFFERS" loop condition from
blas_memory_free will be completely optimized away by GCC. This is
because the condition can only be false after undefined behavior has
already been invoked (reading past the end of an array). As a
consequence of this bug, GCC also removes the subsequent if statement
and all the code after the error label because all of it is dead.

This commit switches the loop condition around so it works as intended.

Fix workspace computation in LAPACKE ?tpmqrt

Fix DYNAMIC_ARCH=1 breaking builds on non-x86 platforms

From netlib PR#144

From netlib PR#144

From netlib PR#144

from netlib PR #144

Add trivial implementation of cblas_xerbla

README.md update

detect CPU on zArch

Add an extra familiy/model combination used by AMD Steamrolller.

Make FORCE_ZEN option in getarch.c actually set target names to ZEN

Revert Zen param.h to Haswell values (instead of Excavator).

Use GNUInstallDirs to allow changing target directories

* Multi-lib distributions need to change the libdir
  which is only portably possible with `GNUInstallDirs`.
* Multi-arch distributions such as Debian and Exherbo
  need to be able to change the bindir.

add lapack laswp directory for zarch

Fix dynamic detection for ZEN CPUs.

Power8 inline assembly tweaks

Further fixes on top of 9e2f316ed.  Writing some doco for gcc on
inline assembly woke me up to some more errors.

- dgemv_kernel_4x4 asm did not mention *ap as a memory input, and
  *y is both read and write.
- sasum_kernel_32 and casum_kernel_16 did not use %x for a vsx insn
  operand, a problem if the "=f" sum output was ever allocated a vsx
  reg in the altivec set.  This might be possible with inlining and
  future gcc optimisation.

Autodetect AMD A8-6410 as BARCELONA

* Fix integer overflow in DBDSQR

As noted in lapack issue 135, an integer overflow in the calculation of the iteration limit could lead to an immediate return without any iterations having been performed if the input matrix is sufficiently big.

* Fix integer overflow in SBDSQR

As noted in lapack issue 135, an integer overflow in the calculation of the iteration limit could lead to an immediate return without any iterations having been performed if the input matrix is sufficiently big.

* Fix integer overflow in threshold calculation

Related to lapack issue 135, the threshold calculation can overflow as well as the multiplication is evaluated from left to right.
Without explicit parentheses, the calculation would overflow for N >= 18919

* Fix integer overflow in threshold calculation

Related to lapack issue 135, the threshold calculation can overflow as well as the multiplication is evaluated from left to right.
Without explicit parentheses, the calculation would overflow for N >= 18919

Add ZEN support

* fix unlikely memleak in zimatcopy interface

* fix only unlikely memleak in zimatcopy interface

* fix only unlikely memleak in zimatcopy interface

Blas 3 for single precision

Fix compilation with PGI by replacing verbatim _real_, _imag_ extensions and updating macro definitions for modern, C99-capable versions of the PGI compiler