This is part of #340.

New feature extract eulerian particles

New functionality to extract particle data from multiphase calculations and replay the data in lagrangian cases, using both the raw input particle data, and data processed into a (smaller) set of injection locations.

See merge request !82

ENH: Added tutorials to show extraction of particle data from eulerian cases and subsequent injjection via lagrangian cases

Description
    Replays an set of particle data based on an injectedParticleCloud,
    using the assumption of one particle per parcel.

Usage
    \verbatim
    model1
    {
        type            injectedParticleInjection;
        SOI             0;
        massTotal       0; // Place holder only
        parcelBasisType fixed;
        nParticle       1; // 1 particle per parcel
        cloud           eulerianParticleCloud;
        positionOffset  (-0.025 2 -0.025);
    }
    \endverbatim

Description
    Interrogates an injectedParticleCloud to convert the raw particle
    data into a set of 'binned' injectors.

    The bins are set according to the particle \c tag property, from which:
    - diameters are converted into \c general distributions with a
      user-specified bin width
    - raw velocity and diameter data are resampled and stored to provide
      variations per injector

    The mass to inject can be set according to the raw input data mass total
    by using the \c applyDistributionMassTotal switch

Usage
    \verbatim
    model1
    {
        type            injectedParticleDistributionInjection;
        SOI             0;
        parcelBasisType mass;
        cloud           eulerianParticleCloud;
        positionOffset  (-0.025 2 -0.025);
        binWidth        0.1e-3;
        parcelsPerInjector 500;
        resampleSize    100;                    // optional
        applyDistributionMassTotal yes;

        // Placeholder only when using applyDistributionMassTotal
        massTotal       0;
    }
    \endverbatim

Note
    The each injector location is assumed to be operating under steady
    conditions, i.e. using a constant flow rate profile

SourceFiles
    InjectedParticleDistributionInjection.C

See also
    Foam::injectedParticle
    Foam::injectedParticleCloud
    Foam::functionObjects::extractEulerianParticles
    Foam::distributionModels::general

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