- use allocator class to wrap the stream pointers instead of passing
  them into ISstream, OSstream and using a dynamic cast to delete
  then. This is especially important if we will have a bidirectional
  stream (can't delete twice!).

STYLE:

- file stream constructors with std::string (C++11)

- for rewind, explicit about in|out direction. This is not currently
  important, but avoids surprises with any future bidirectional access.

- combined string streams in StringStream.H header.
  Similar to <sstream> include that has both input and output string
  streams.

- elminate the foamVtkFormatter operator() in favour of xmlAttr.
  Improves readability and the purpose is clearer.

- The reader module allows two levels of caching.
  The OpenFOAM fvMesh can be cached in memory, for faster loading of
  fields. Additionally, the translated VTK geometries are held in a
  local cache. The cached VTK geometries should incur no additional
  overhead since they use the VTK reference counting for their storage
  management.

ENH: Paraview modules.

- Update props with int, not bool (for more versatility)
- Set properties and tool-tips directly on widgets instead of buttons

- this allows filling in the VTK structures without intermediate data
  and without sequencial insertion. Should be faster and smaller
  than the previous cell-wise insertion methods.
  Most importantly, it improves code reuse.

- this greatly simplifies data management and opens the possibility of
  reusing converted vtk meshes instead of converting each time.

- has the selected values directly and use these lookup names to store
  directly into a hash. This replaces several parallel lists of
  decomp information etc and makes it easier.

- improves the overview of the code

- avoids potentially issues if we reusing a vtkPoints array,
  and should be marginally faster without the additional
  range checking.

- adds flexiblity and reduces risk of memory leaks as we add/change
  features

STYLE: adjust naming for paraview internal polyDecomp

- easier to detect the implicit grouping

- also use updated forAll* macros

COMP: avoid undefined-var-template warning in runTimePostProcessing

- simplifies organization, includes, linkage etc.

- less clutter and typing to use the default template parameter when
  the key is 'word' anyhow.

- use EdgeMap instead of the longhand HashTable version where
  appropriate

- they don't use scotch/metis anyhow, which are the only things
  placed in FOAM_EXT_LIBBIN

- can be used directly from within an application or function-object.
  Makes it available for dictionaries.

STYLE: improve consistency in Allwclean scripts

- reduces unexpected interactions between various make elements

- more stable/predictable to check for a bounding box !empty() rather
  than comparing to greatBox directly.

Eg,
    librunTimePostProcessing.so
    librunTimePostProcessing.so.7 -> librunTimePostProcessing.so.7.1.0
    librunTimePostProcessing.so.7.1.0

- centralize handling of paraview/vtk versioning into wmake/cmakeFunctions

- add support for patch names in block mesh reader.

- as originally intended years ago, but never actually done.

- use 'foamPvCore' instead of 'vtkPVReaders' to avoid potential name
  collisions with any 'vtk*' files and since we may reuse these
  functions in other foam-paraview modules (not just readers).

STYLE: use same font size/colour for patch-names as for point-numbers

BUG: repair issue with single time-step

- paraview time-selector returns '0' as the requested time if there is
  only one time step. However, if we have skipped the 0/ directory,
  this single time step is likely a non-zero value.

- use "-pvMAJ.MIN" suffix for similarity with the paraview convention

- use sentinel file to ensure clean change of intermediate targets

- ensure all library files are being properly removed

- remove old (ParaView-3) files

- Works in 4.4.0, 5.0.1, 5.2.0 etc

STYLE:
- slots now use SM properties directly without a second lookup.
  This reduces exposure of the QT elements and simplifies the coding.

- avoid focus borders on the Qt elements

- place the "use Polyhedron" checkbox into a column

- move "Cache Mesh" down in the GUI (an advanced feature and thus
  should be less prominent)

- obtain button labels/tooltip directly from the XML content

- use property group customization instead of individual pqPropertyWidget

- although this is not the final desired form, since it uses
  individual pqPropertyWidget customizations (ie, ugly layout, too
  many bits of code), but is an interesting intermediate solution
  that may be useful in other contexts.

    - Removed the camera 'mode'
    - The (old) static camera was only appropriate when parallel
      projection was inactive, and the view was centred at (0 0 0)
    - Camera input now always requires 'position' and 'focalPoint'
    - Clip box is now optional.  Note that this is applied after the
      camera
      set-up and so will override the camera position
    - View angle is only appropriate when not using parallel projection
    - Zoom now required, applied after all other operations
      - 1 = do nothing, >1 = zoom in, <1 = zoom out

    Example input:

        camera
        {
            // Total number of frames to generate
            nFrameTotal 1;

            // Parallel projection flag
            parallelProjection no;

            // Optional clippling box
            clipBox     (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005);
            focalPoint  (0 0 0);
            up          (0 1 0);
            position    (0 0 1);
            viewAngle   20;
            zoom        1.1;
        }

Resolves bug-report http://bugs.openfoam.org/view.php?id=2372