message: Rename _role to role
diff: namespace {
  - void BasicCheck(Population::PersonRole _role);
  + void BasicCheck(Population::PersonRole role);
  }
  @@ -152,12 +152,12 @@ namespace {
  *
  * \throws std::runtime_exception if Child/Student/Retired is asked for.
  */
  - void BasicCheck(Population::PersonRole _role)
  + void BasicCheck(Population::PersonRole role)
  {
  - if (_role == Population::PersonRole::ROLE_CHILD || _role == Population::PersonRole::ROLE_STUDENT || _role == Population::PersonRole::ROLE_RETIRED)
  + if (role == Population::PersonRole::ROLE_CHILD || role == Population::PersonRole::ROLE_STUDENT || role == Population::PersonRole::ROLE_RETIRED)
  {
  std::string _popRole;
  - switch (_role)
  + switch (role)
  {
  case Population::PersonRole::ROLE_CHILD: _popRole = "Population::PersonRole::ROLE_CHILD"; break;
  case Population::PersonRole::ROLE_STUDENT: _popRole = "Population::PersonRole::ROLE_STUDENT"; break;
  