message: adapt the error bound with value_type
diff: @@ -316,21 +316,23 @@ TEST_F(ParIlut, KernelThresholdSelectMaxIsEquivalentToRef)
  TEST_F(ParIlut, KernelComplexThresholdSelectIsEquivalentToRef)
  {
  test_select(mtx_l_complex, dmtx_l_complex,
  - mtx_l_complex->get_num_stored_elements() / 3, 1e-14);
  + mtx_l_complex->get_num_stored_elements() / 3,
  + 50 * r<value_type>::value);
  }
  TEST_F(ParIlut, KernelComplexThresholdSelectMinIsEquivalentToRef)
  {
  // can change the threshold?
  - test_select(mtx_l_complex, dmtx_l_complex, 0, 1e-14);
  + test_select(mtx_l_complex, dmtx_l_complex, 0, 50 * r<value_type>::value);
  }
  TEST_F(ParIlut, KernelComplexThresholdSelectMaxLowerIsEquivalentToRef)
  {
  test_select(mtx_l_complex, dmtx_l_complex,
  - mtx_l_complex->get_num_stored_elements() - 1, 1e-14);
  + mtx_l_complex->get_num_stored_elements() - 1,
  + 50 * r<value_type>::value);
  }
  