Fixes memory leak in CIVET valgrind tests

  This fixes the memory leak in NEML causing these errors and
  corrects the original NEML driver to reflect the new API names
  for internal variables.

  closes idaholab#310

src/materials/NEMLStressBase.C

@@ -88,10 +88,10 @@ NEMLStressBase::computeQpStress()
   double T_np1 = _temperature[_qp];
   double T_n = _temperature_old[_qp];
 
-  mooseAssert(_model->nhist() == _hist[_qp].size(), "History data storage size mismatch");
-  double * const h_np1 = (_model->nhist() > 0 ? _hist[_qp].data() : nullptr);
-  mooseAssert(_model->nhist() == _hist_old[_qp].size(), "History data storage size mismatch");
-  const double * const h_n = (_model->nhist() > 0 ? _hist_old[_qp].data() : nullptr);
+  mooseAssert(_model->nstore() == _hist[_qp].size(), "History data storage size mismatch");
+  double * const h_np1 = (_model->nstore() > 0 ? _hist[_qp].data() : nullptr);
+  mooseAssert(_model->nstore() == _hist_old[_qp].size(), "History data storage size mismatch");
+  const double * const h_n = (_model->nstore() > 0 ? _hist_old[_qp].data() : nullptr);
 
   double A_np1[36];
 
@@ -198,9 +198,9 @@ NEMLStressBase::initQpStatefulProperties()
   ComputeStressBase::initQpStatefulProperties();
 
   // Figure out initial history
-  _hist[_qp].resize(_model->nhist());
+  _hist[_qp].resize(_model->nstore());
 
-  if (_model->nhist() > 0)
+  if (_model->nstore() > 0)
   {
     try
     {