tabulatedAccelerationSource: New fvOption to support 6-DoF solid-body motion

Example usage:

SBM
{
    type            tabulatedAccelerationSource;
    active          true;
    selectionMode   all;

    tabulatedAccelerationSourceCoeffs
    {
        timeDataFileName "constant/acceleration.dat";
    }
}

Where the file constant/acceleration.dat contains a list of tuples
containing time and a vector of the linear acceleration, angular
velocity and angular acceleration e.g.

100
(
(0 ((0 0 0) (0 0 0) (0 0 0)))
(0.001 ((-0.0001 0 4e-05) (5e-5 -0.0002 -3e-8) (0.24 -0.8 -1e-4)))
.
.
.
)