fixing PETScNewtonKrylovSolver::setOptionsPrefix()
fixing PETScNewtonKrylovSolver::setOptionsPrefix()

huahbo/IBAMR,yaojieuh/IBAMR,yaojieuh/IBAMR,iamciera/IBAMR,yaojieuh/IBAMR,iamciera/IBAMR,iamciera/IBAMR,huahbo/IBAMR,huahbo/IBAMR,huahbo/IBAMR,huahbo/IBAMR,iamciera/IBAMR,yaojieuh/IBAMR,iamciera/IBAMR,huahbo/IBAMR,yaojieuh/IBAMR,iamciera/IBAMR,huahbo/IBAMR,iamciera/IBAMR,yaojieuh/IBAMR,yaojieuh/IBAMR