Pstream: added maxCommsSize setting to do (unstructured) parallel transfers in blocks.

Tested:
- with maxCommsSize 0 produces exactly same result as plus.develop
- compiles with label64
- with maxCommsSize e.g. 3 produces exactly same result as plus.develop
- with maxCommsSize=0 exactly the same messages (with Pstream::debug = 1) as plus.develop

See merge request !85

Applies a displacementLaplacian on top of a solid-body motion function

ENH: Usage of locationsInMesh for tutorial and other fix

- Example for Using multiple locations in mesh
- bugFix for rhoPimpleFoam case

See merge request !86

- helpful when testing various builds

This is controlled by the setting maxCommsSize in etc/controlDict which
specifies the max number of bytes per exchange. If set to <= 0 it
is ignored. This max size of messages is important when doing e.g.
load balancing which can send over whole meshes.

Takes cellZones and motionSolver per cellZone. See also dynamicMotionSolverListFvMesh.

ENH: outletMappedUniformInlet BC - Cp only calculated for patch and not entire domain; input keywords updated for consistency

- slightly odd. Building CGAL on other Linux systems have a proper
  ldd dependency for gmp/mpfr, but ubuntu doesn't

Patch contributed by Mattijs Janssens
http://bugs.openfoam.org/view.php?id=2382

which provided warning about backward-compatibility issue with setting div
schemes for steady-state.  It caused confusion by generating incorrect warning
messages for compressible cases for which the 'bounded' should NOT be applied to
the 'div(phid,p)'.

to clarify purpose.

Patch contributed by Mattijs Janssens

Patch contributed by Mattijs Janssens
Resolves bug-report http://bugs.openfoam.org/view.php?id=2380

Patch contributed by Battijs Janssens
Resolves bug-report http://bugs.openfoam.org/view.php?id=2383

Patch contributed by Mattijs Janssens