Implemented missing vsx simd  kernels for power8 blas1/2 double. z13 modifications

Add multithreading support for Haswell DDOT

z13: improved zgemv_(t|n)_4,zscal,zaxpy

Use generic/dot.c instead of the inferior arm/dot.c for x86 DSDOT

to resolve dsdot utest failure seen in #1492

copied from ashwinyes' implementation in dot_thunderx2t99.c

as the inaccuracies seen in the original testcase for #1332 appear to be due to an artefact that amplifies the very small rounding differences between FMA and discrete multiply+add

Power8 blas3 copy-pack routines

Replace .align with .p2aligns in dscal.c and the Nehalem microkernels as well

Fix limited DSDOT precision on arm,aarch64 and zarch

The default arm/dot.c is less precise when used for DSDOT, as shown by utest

The implementation in arm/dot.c has lower precision, as shown by the utest for dsdot.

The OSX assembler apparently mishandles the argument to decimal .align, leading to a significant loss of performance 
as observed in #730, #901 and most recently #1470

* Restore the remaining utests

* Try fork test on Cygwin and Linux only, it hangs on at least ARMv8/Android as well

* Use generic sswap/dswap kernels for NEHALEM 32bit to fix fault found by the restored swap utest

* Disable zdotu test for MS cl to work around runtime error -1073741819 on AppVeyor for now
(probably coding error in the initialization of the complex numbers or wrong choice of zdotu API)

ref #1439

small corrections

Initialize unitialized values for repeated calls

small fix inside ifdef z13mvc . (z13mvc code is not used in production)

Fixes #1432 (and possibly other DTRMM-related failures on Haswell and related architectures when built with cmake)

(Z13 ) Blas1 mikrokernels can be inlined by gcc. Refactoring,fixes,tunings

names). Some fixes and tunings

(Z systems Z13) small fixes, some (i(dz)amin,i(dz)amax,(dz)dot,(dz)asum) mikrokernels…

Address warnings #1357

Tag %1 and %2 as both input and output operands

fix from #1292 extended to the other gemv microkernels

Tag %1 and %2 as both input and output

Address few more warnings

The inline assembly modifies its input operands, so mark them as output to avoid surprises with optimization. Fixes #1292