message: make iteration counter in CGS 0-based again
diff: @@ -149,7 +149,7 @@ void Cgs<ValueType>::apply_dense_impl(const matrix::Dense<ValueType> *dense_b,
  r.get());
  r_tld->copy_from(r.get());
  - int iter = 0;
  + int iter = -1;
  /* Memory movement summary:
  * 28n * values + 2 * matrix/preconditioner storage
  * 2x SpMV: 4n * values + 2 * storage
  