PolynomialEntry: Templated polynomial DataEntry to support all basic field...

PolynomialEntry: Templated polynomial DataEntry to support all basic field types from scalar to tensor
This allows polynomial functions for e.g. velocity to be specified in the uniformFixedValue BC

Consider a linear function for Ux(t) with Uy and Uz = 0:

    inlet
    {
        type            uniformFixedValue;
        uniformValue    polynomial
        (
            ((10 0 0)   (0 0 0))
            ((100 0 0)  (1 0 0))
        );
    }

Resolves bug report http://www.openfoam.org/mantisbt/view.php?id=1508