ENH: Made interpolationMethodToWord function static

src/meshTools/AMIInterpolation/AMIInterpolation/AMIInterpolation.C

@@ -639,7 +639,7 @@ Foam::word
 Foam::AMIInterpolation<SourcePatch, TargetPatch>::interpolationMethodToWord
 (
     const interpolationMethod& im
-) const
+)
 {
     word method = "unknown-interpolationMethod";
 

src/meshTools/AMIInterpolation/AMIInterpolation/AMIInterpolation.H

@@ -302,10 +302,10 @@ public:
             label singlePatchProc() const;
 
             //- Convert interpolationMethod to word representation
-            word interpolationMethodToWord
+            static word interpolationMethodToWord
             (
                 const interpolationMethod& method
-            ) const;
+            );
 
 
             // Source patch