fix bug 223: SparseMatrix::Flags no longer encode triangularness information
fix bug 223: SparseMatrix::Flags no longer encode triangularness information

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