Low Energy or High Precision Neutron Elastic

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Model: G4NeutronHPorLElastic

Description:
- This model generates the final state for neutron elastic scattering using the high precision neutron model when sufficient high precision data is available for the selected element or isotope. When there is insufficient data, the neutron is elastically scattered using the less precise Low Energy Parameterized model.
Invocation:
- ```
G4NeutronHPorLElastic* elasticModel = new G4NeutronHPorLElastic();
G4HadronElasticProcess* elProcess = new G4HadronElasticProcess();
elProcess->RegisterMe(elasticModel);
processManager->AddDiscreteProcess(elProcess);
```
- NOTE: User must first download high precision neutron data files from Geant4 web page to a local directory, say G4NDL/, then
```
setenv NeutronHPCrossSections /G4NDL
```
- Valid for particles:
  - neutron
- Energy range:
  - 0 - 20 MeV
- Alternate models:
  - G4LElastic
  - G4NeutronHPElastic
- Used in physics lists:
  - LHEP_HP, LHEP_BERT_HP, LHEP_BIC_HP, LHEP_LEAD_HP,
  - LHEP_PRECO_HP, QGSP_HP, QGSC_LEAD_HP