quick bugfix in QR::isFullRank() (not 100% sure about the reference value for the comparison to 0)
quick bugfix in QR::isFullRank() (not 100% sure about the reference value
for the comparison to 0)

pthulhu/eigen,cjntaylor/eigen,toastedcrumpets/eigen,cjntaylor/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,toastedcrumpets/eigen,Zefz/eigen,TSC21/Eigen,cjntaylor/eigen,pasuka/eigen,Zefz/eigen,ritsu1228/eigen,toastedcrumpets/eigen,pasuka/eigen,ritsu1228/eigen,TSC21/Eigen,ritsu1228/eigen,Zefz/eigen,ritsu1228/eigen,pthulhu/eigen,pthulhu/eigen,toastedcrumpets/eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen,cjntaylor/eigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ritsu1228/eigen,pthulhu/eigen,pthulhu/eigen,pasuka/eigen,TSC21/Eigen,TSC21/Eigen