Provides run-time selection of buoyancy sources for compressible solvers

Replaces the built-in buoyancy sources in XiFoam, reactingFoam and
rhoReactingFoam.

e.g. in constant/fvOptions specify

momentumSource
{
    type            buoyancyForce;

    buoyancyForceCoeffs
    {
        fieldNames      (U);
    }
}

and optionally specify the buoyancy energy source in the enthalpy
equation:

energySource
{
    type            buoyancyEnergy;

    buoyancyEnergyCoeffs
    {
        fieldNames      (h);
    }
}

or internal energy equation

energySource
{
    type            buoyancyEnergy;

    buoyancyEnergyCoeffs
    {
        fieldNames      (e);
    }
}

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1923

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1479
Patches provided by Bruno Santos based on the work of Mattijs Janssens

Patch provided by Daniel Jasinski
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1893

Note the dictionary is in OpenFOAM format not CHEMKIN.

Patch provided by Daniel Jasinski
Resolves feature request http://www.openfoam.org/mantisbt/view.php?id=1888

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1920

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1921

-append: append to log file
-overwrite: overwrite log file
Original patch provided by Timm Severin
Resolves feature request http://www.openfoam.org/mantisbt/view.php?id=1919

Simplifies lookup of RAS or LES models

Pressure relaxation is useful with LTS to damp acoustic waves

This functionality is inherited by the waveTransmissive BCs

e.g.

    DarcyForchheimerCoeffs
    {
        d   (5e7 -1000 -1000);
        f   (0 0 0);

        coordinateSystem
        {
            type    cartesian;
            origin  (0 0 0);
            coordinateRotation
            {
                type    axesRotation;
                e1      (1 0 0);
                e2      (0 0 1);
            }
        }
    }

Patches provided by Juho Peltola

reactingEulerFoam/interfacialModels/wallDampingModels: Added interpolatedWallDamping abstract base-class
To simplify linear, sine and cosine wall-damping implementation

New lift model supporting near-wall damping using the new
wallDampingModels.

e.g.

lift
(
    (air in water)
    {
        type            wallDamped;
        lift
        {
            type            constantCoefficient;
            Cl              0.5;
        }
        wallDamping
        {
            type            linear;
            Cd              0.5;
        }
    }
);

in which a linear near-wall damping function min(y/(Cd*d), 1) is applied to the constant
coefficient lift model.  Additional wall-damping functions will be added.

to allow iteration over the energy equations to improve stability for phase-change.
Additionally if nEnergyCorrectors is set to 0 the energy equations are
not solved which may be beneficial during the startup of some cases.

blockMeshDict files moved to system directory (new default location) in template cases and unit test cases

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1913

Now applies totalPressure and pressureInletOutletVelocity with hRef set
to the height of the outlet plane.

Now applies totalPressure and pressureInletOutletVelocity with hRef set
to the height of the outlet plane.