ENH: extended runTimePostProcessing (#1206)

- Extended runTimePostProcessing to include access to "live"
  simulation objects such a geometry patches and sampled surfaces
  stored on the "functionObjectObjects" registry.

- Add 'live' runTimePostProcessing of cloud data.
  Extracts position and fields from the cloud via its objectRegistry writer

- For the "live" simulation objects, there are two new volume filters
  that work directly with the OpenFOAM volume fields:
      * iso-surface
      * cutting planes
  Both use the VTK algorithms directly and support multiple values.
  Eg, can make multiple iso-levels or multiple planes parallel to each
  other.

- When VTK has been compiled with MPI-support, parallel rendering will
  be used.

- Additional title text properties (shadow, italic etc)

- Simplified handling of scalar-bar and visibility switches

- Support multiple text positions. Eg, for adding watermark text.

src/functionObjects/graphics/runTimePostProcessing/functionObjectCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2015-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -27,7 +25,17 @@ Class
     Foam::functionObjects::runTimePostPro::functionObjectCloud
 
 Description
-    Visualisation of cloud data from function object output
+    Visualisation of cloud data from function object output (file-based only).
+
+    Dictionary controls
+    \table
+        Property    | Description                           | Required | Default
+        type        | The point type: functionObjectCloud   | yes |
+        functionObject | The data source                    | yes |
+        cloud         | The cloud name                      | no  |
+        field         | The field for glyphs scaling        | no  |
+        colourField   | The field to display                | no  |
+    \endtable
 
 SourceFiles
     functionObjectCloud.C
@@ -87,7 +95,7 @@ protected:
 public:
 
     //- Run-time type information
-    TypeName("functionObjectCloud");
+    TypeNameNoDebug("functionObjectCloud");
 
 
     // Constructors
@@ -107,7 +115,14 @@ public:
 
     // Member Functions
 
-        //- Add tube(s) to scene
+        //- Add cloud to scene (using file source)
+        bool addGeometryFromFile
+        (
+            const scalar position,
+            vtkRenderer* renderer
+        );
+
+        //- Add cloud to scene
         virtual void addGeometryToScene
         (
             const scalar position,