ENH: provide dictionary access for coded BCs etc (#1922)

- in some cases, additional dictionary inputs are useful for extending
  the input parameters or functionality of dynamic coded conditions.

  Typically this can be used to provide a simple set of dictionary
  inputs that are used to drive specific code, but allows changing the
  inputs without causing a recompilation.

  Accessed with this type of code:
  ```
  const dictionary& dict = this->codeContext();
  ```

boundary conditions and function objects:

* specify an additional codeContext dictionary entry:
  ```
  codeContext
  {
      ...
  }
  ```

PatchFunction1:

* The code context dictionary is simply the dictionary used to specify
  the PatchFunction1 coefficients.

  To replicated persistant data, use local member static data.
  Eg,
  ```
  code
  #{
      // Persistent (Member) Data
      static autoPtr<Function1<scalar>> baseVel;
      static autoPtr<Function1<vector>> baseDir;
      ...
  #}
  ```

fvOptions:

* currently not applicable

etc/codeTemplates/dynamicCode/fixedValuePointPatchFieldTemplate.H

@@ -38,6 +38,7 @@ SourceFiles
 #define coded_fixedValuePointPatchTemplate${FieldType}_H
 
 #include "fixedValuePointPatchFields.H"
+#include "dictionaryContent.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -50,7 +51,8 @@ namespace Foam
 
 class ${typeName}FixedValuePointPatch${FieldType}
 :
-    public fixedValuePointPatchField<${TemplateType}>
+    public fixedValuePointPatchField<${TemplateType}>,
+    public dictionaryContent
 {
     //- The parent boundary condition type
     typedef fixedValuePointPatchField<${TemplateType}> parent_bctype;
@@ -141,6 +143,12 @@ public:
 
     // Member Functions
 
+        //- Code context as a dictionary
+        const dictionary& codeContext() const
+        {
+            return dictionaryContent::dict();
+        }
+
         //- Update the coefficients associated with the patch field
         virtual void updateCoeffs();
 };