ENH: Function1 and PatchFunction1 improvements (#1917)

- easier support for non-mandatory functions.

  In some boundary conditions it can be desirable to support
  additional functions, but not necessarily require them. Make this
  easier to support with a Function1, PatchFunction1 NewIfPresent()
  selector.

- support for compatibility lookups

- harmonize branching logic and error handling between Function1 and
  PatchFunction1.

ENH: refactor a base class for Function1, PatchFunction1

- includes base characteristics, patch or scalar information

ENH: additional creation macros

- makeConcreteFunction1, makeConcretePatchFunction1Type for adding a
  non-templated function into the correct templated selection table.
  makeScalarPatchFunction1 for similarity with makeScalarFunction1

src/OpenFOAM/primitives/functions/Function1/Scale/Scale.H

@@ -6,6 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2017 OpenFOAM Foundation
+    Copyright (C) 2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -106,9 +107,6 @@ class Scale
         //- Read the coefficients from the given dictionary
         void read(const dictionary& coeffs);
 
-        //- No copy assignment
-        void operator=(const Scale<Type>&) = delete;
-
 
 public:
 
@@ -116,6 +114,12 @@ public:
     TypeName("scale");
 
 
+    // Generated Methods
+
+        //- No copy assignment
+        void operator=(const Scale<Type>&) = delete;
+
+
     // Constructors
 
         //- Construct from entry name and dictionary
@@ -140,6 +144,9 @@ public:
 
         //- Write in dictionary format
         virtual void writeData(Ostream& os) const;
+
+        //- Write coefficient entries in dictionary format
+        void writeEntries(Ostream& os) const;
 };