Fix GMRES: Initialize essential Householder vector with correct dimension. Add check if initial guess is already a sufficient approximation.
Fix GMRES: Initialize essential Householder vector with correct dimension. Add check if initial guess is already a sufficient approximation.

rotorliu/eigen,madlib/eigen_backup,madlib/eigen_backup,rotorliu/eigen,rotorliu/eigen,madlib/eigen_backup,mjbshaw/Eigen,mjbshaw/Eigen,rotorliu/eigen,madlib/eigen_backup,mjbshaw/Eigen,mjbshaw/Eigen