Merge branch 'feature-functionObjects' of develop.openfoam.com:Development/OpenFOAM-dev-OpenCFD into feature-functionObjects

- Allows generation of images (currently PNG files) during the run
- ... or afterwards by invoking the execFlowFunctionObjects utility
- Wrapper around VTK functionality
- Support for objects:
  - text
  - points (glyphs: sphere, arrow)
  - lines (tubes)
  - surfaces (wireframe, shaded, combination)
- Colour using:
  - user-defined
  - field values (several colour maps availale)
- For image sequences:
  - dynamic views (camera movement)
  - objects can appear/disappear using opacity
- Building
  - VTK dependency v6+
  - satisfied using ParaView from ThirdParty directory
  - or separate VTK installation

- New boundaryData surface writer
- Moved templated code into separate files
- Output filenames written to functionObjectState dictionary
- Ensight surface writer now supports a 'collate times' option [mattijs]
- Nastran surface writer updated based on user feedback

Properties stored in state dictionary:
- Moment coefficient: Cm
- Drag coefficient: Cd
- Lift coefficient: Cl
- Front lift coefficient: Cl(f)
- Rear lift coefficient: Cl(r)

Properties stored in state dictionary:
- normalForce
- tangentialForce
- porousForce
- normalMoment
- tangentialMoment
- porousMoment

Properties stored in state dictionary:
- minimum value: min<identifier>
- position of minimum value: min<identifier>_position
- processor ID of minimum value: min<identifier>_processor
- maximum value: max<identifier>
- position of maximum value: max<identifier>_position
- processor ID of maximum value: max<identifier>_processor

Also
- added documentation to header
- added 'resultName' to enable user to specify alternative name for
  output field

Also added 'resultName' to enable user to specify alternative name for
output field

Also added output of diameter info, D10, D32 and DMax

Note: added as a pointer since the list operates in multiple modes, e.g.
as constructed by the Time database and 'outside' by
execFlowFunctionObjects

Class now provides helper functions to generate files on-the-fly by
function objects, as opposed to attempting to control all files needed
by the function object (earlier implementation lead to over-complication
and was error prone)

This new class provides function objects with a database (dictionary)
to store current state information to enable smooth restart behaviour.
Additionally, current results can be stored so that they can be accessed
between different objects.

- Allows generation of images (currently PNG files) during the run
- ... or afterwards by invoking the execFlowFunctionObjects utility
- Wrapper around VTK functionality
- Support for objects:
  - text
  - points (glyphs: sphere, arrow)
  - lines (tubes)
  - surfaces (wireframe, shaded, combination)
- Colour using:
  - user-defined
  - field values (several colour maps availale)
- For image sequences:
  - dynamic views (camera movement)
  - objects can appear/disappear using opacity
- Building
  - VTK dependency v6+
  - satisfied using ParaView from ThirdParty directory
  - or separate VTK installation

- New boundaryData surface writer
- Moved templated code into separate files
- Output filenames written to functionObjectState dictionary
- Ensight surface writer now supports a 'collate times' option [mattijs]
- Nastran surface writer updated based on user feedback

functionObjects only get detroyed when the runTime gets destroyed. So the
mesh is already destroyed and we cannot hold e.g. a volScalarField since
that will try to 'checkOut' from the objectRegistry(=mesh) upon destruction.
Note that we only see this in chtMultiRegionFoam.

This bc was in compressible turbulence library which made it dependent
on liquidProperties. It was moved to a separate library since it is only
used in a single tutorial.