git-svn-id: https://geuz.org/svn/gmsh/trunk@18562 59c8cabf-10d6-4a28-b43f-3936b85956c4
linearSystemPETSc<fullMatrix<double> > : some petsc version require to
set the ROW_ORIENTED option after the matrix pre-allocation

git-svn-id: https://geuz.org/svn/gmsh/trunk@18563 59c8cabf-10d6-4a28-b43f-3936b85956c4