ENH: ensure that content changes in coded objects are noticed (#1293)

- for codedFunctionObject and CodedSource the main code snippets
  were not included in the SHA1 calculation, which meant that many
  changes would not be noticed and no new library would be compiled.

  As a workaround, a dummy 'code' entry could be used solely for the
  purposes of generating a SHA1, but this is easily forgotten.

  We now allow tracking of the dynamicCodeContext for the coded
  objects and append to the SHA1 hasher with specific entries.
  This should solve the previous misbehaviour.

  We additionally add information about the ordering of the code
  sections. Suppose we have a coded function object (all code
  segments are optional) with the following:

      codeExecute "";
      codeWrite   #{ Info<< "Called\n"; #};

  which we subsequently change to this:

      codeExecute #{ Info<< "Called\n"; #};
      codeWrite   "";

  If the code strings are simply concatenated together, the SHA1 hashes
  will be identical. We thus 'salt' with their semantic locations,
  choosing tags that are unlikely to occur within the code strings
  themselves.

- simplify the coded templates with constexpr for the SHA1sum
  information.

- Correct the CodedSource to use 'codeConstrain' instead of
  'codeSetValue' for consistency with the underlying functions.

etc/codeTemplates/dynamicCode/fixedValueFvPatchFieldTemplate.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) YEAR AUTHOR,AFFILIATION
@@ -52,10 +52,18 @@ class ${typeName}FixedValueFvPatch${FieldType}
 :
     public fixedValueFvPatchField<${TemplateType}>
 {
+    // Private Member Functions
+
+        //- Report a message with the SHA1sum
+        inline static void printMessage(const char* message)
+        {
+            Info<< message << " sha1: " << SHA1sum << '\n';
+        }
+
 public:
 
-    //- Information about the SHA1 of the code itself
-    static const char* const SHA1sum;
+    //- SHA1 representation of the code content
+    static constexpr const char* const SHA1sum = "${SHA1sum}";
 
     //- Runtime type information
     TypeName("${typeName}");
@@ -126,7 +134,7 @@ public:
     virtual ~${typeName}FixedValueFvPatch${FieldType}();
 
 
-    // Member functions
+    // Member Functions
 
         //- Update the coefficients associated with the patch field
         virtual void updateCoeffs();