STYLE: avoid unrestricted dictionary lookup in randomProcesses, waveModels

- ref issue #762

STYLE: consistency in file vs files for pointNoise and surfaceNoise

- use "files" when available, fallback to "file" otherwise.

src/waveModels/waveAbsorptionModels/base/waveAbsorptionModel/waveAbsorptionModel.H

@@ -71,7 +71,7 @@ public:
     );
 
     //- Destructor
-    virtual ~waveAbsorptionModel();
+    virtual ~waveAbsorptionModel() = default;
 
 
     // Public Member Functions