ENH: use GeometricField clamp_min, clamp_max, clamp_range

- newer naming allows for less confusing code.
  Eg,
      max(lower)  ->  clamp_min(lower)
      min(upper)  ->  clamp_max(upper)

- prefer combined method, for few operations.
  Eg,
      max(lower) + min(upper) -> clamp_range(lower, upper)

  The updated naming also helps avoid some obvious coding errors.
  Eg,

     Re.min(1200.0);
     Re.max(18800.0);

  instead of
     Re.clamp_range(1200.0, 18800.0);

- can also use implicit conversion of zero_one to MinMax<Type> for
  this type of code:

      lambda_.clamp_range(zero_one{});

applications/utilities/preProcessing/applyBoundaryLayer/applyBoundaryLayer.C

@@ -92,7 +92,7 @@ void blendField
         volScalarField fld(fieldHeader, mesh);
         scalarField& pf = fld.primitiveFieldRef();
         pf = (1 - mask)*pf + mask*boundaryLayerField;
-        fld.max(SMALL);
+        fld.clamp_min(SMALL);
 
         // Correct the processor patches only.
         // Do not correct BC
@@ -131,7 +131,7 @@ void calcOmegaField
         scalarField& pf = omega.primitiveFieldRef();
 
         pf = (1 - mask)*pf + mask*epsilonBL/(Cmu*kBL + SMALL);
-        omega.max(SMALL);
+        omega.clamp_min(SMALL);
 
         // Correct the processor patches only.
         // Do not correct BC