ENH: Initial commit of new particleDistribution FO - generates 'general' distribution for lagrangian particle clouds

Merge branch 'feature-extract-eulerian-particles' of develop.openfoam.com:Development/OpenFOAM-plus into feature-extract-eulerian-particles

ENH: extractEulerianParticles FO - refactored to output a cloud of particles - distribution analysis to follow...

Generates discrete particle data from multiphase calculations by
interrogating the phase fraction field at a faceZone.

Data is written in raw form, i.e. per particle collected, with
as an optional binned distribution

- only occurs in combination with distributedTriSurfaceMesh in snappy.

- workaround similar to that previously used for surfaceRedistributePar
  (issue #60).

Minor adjustment of incompressible motorBike tutorial to detect use of
distributedTriSurfaceMesh.

- there was a slight mix of MUST_READ and MUST_READ_IF_MODIFIED
  but with no obvious code to handle runtime modified values
  of the decomposition, or how this works with alternative
  dictionaries.

* boost 1_62_0 (Sept 2016)

* CGAL 4.9 (Sept 2016)
  - now has headers-only mode that could be interesting

* FFTW 3.3.5 (Jul 2016)

* openmpi 1.10.4 (Sept 2016)
  - the first openmpi 2.x release is also available, but too early to switch

* paraview 5.2.0 (Nov 2016)
  - builds without additional patching

STYLE: removed unneeded CMake environment variables

and single phase cases. Registration of the compressed flux in interFoam as it is
needed for the FO if used.

Conflicts:
	tutorials/combustion/fireFoam/LES/compartmentFire/Allclean

- in specific cases it can be useful to suppress searching the instances.
  For example, if one only wishes to check if a "points" is available at
  the given time instance, without searching backwards through all
  times.

- Avoids possible discrepancy when the user selects non-coincidental
  values for executeInterval and writeInterval.

- zeroGradient and ddt2 function objects

- this functionality will be more frequently used in the future,
  thus place in a commonly available location.