added 8x6_fam3 kern; fixed k-vec gen bug in ammsearch
added 8x6_fam3 kern; fixed k-vec gen bug in ammsearch

rakib-hasan/math-atlas,rakib-hasan/math-atlas,rakib-hasan/math-atlas,rakib-hasan/math-atlas,rakib-hasan/math-atlas,rakib-hasan/math-atlas