to encourage testing and feedback

which returns true if the fvPatchField type provides an assignment operator

valuePointPatchField: Change assignment to use the object's internalField rather than that of the argument

Avoids dependency on the state of the argument pointPatchField the
internalField of which may have been de-allocated

which supports re-using the internalField storage

This is a convenient method to set a null-constructed tmp in a
conditional statement.

Resolved bug-report http://www.openfoam.org/mantisbt/view.php?id=1990

with optional specification of the mark/space ratio

    Templated square-wave function with support for an offset level.

        \f[
            a square(f (t - t_0)) s + l
        \f]

    where

    \f$ square(t) \f$ is the square-wave function in range \f$ [-1, 1] \f$
    with a mark/space ratio of \f$ r \f$

    \vartable
        symbol  | Description       | Data type         | Default
        a       | Amplitude         | Function1<scalar> |
        f       | Frequency [1/s]   | Function1<scalar> |
        s       | Type scale factor | Function1<Type>   |
        l       | Type offset level | Function1<Type>   |
        t_0     | Start time [s]    | scalar            | 0
        r       | mark/space ratio  | scalar            | 1
        t       | Time [s]          | scalar
    \endvartable

    Example for a scalar:
    \verbatim
        <entryName> square;
        <entryName>Coeffs
        {
            frequency 10;
            amplitude 0.1;
            scale     2e-6;
            level     2e-6;
        }
    \endverbatim

etc/config.sh and etc/config.csh

This structure is more convenient to add support for other shells, e.g. zsh, fish etc.

Resolves feature request to simplify support for other shells in
http://www.openfoam.org/mantisbt/view.php?id=1232

to support time-variation

to support time-variation

noSlip is equivalent to fixedValue with a value of (0 0 0) but is
simpler to specify e.g.

     upperWall
     {
         type            noSlip;
     }

movingWallVelocityFvPatchVectorField: Updated to obtain the velocity field from the dimensionedInteralField
rather than by "lookup" from the database.

To see the different behavior of flow through and around the blockage
change D in constant/fvOptions:

        // D 100;  // Very little blockage
        // D 200;  // Some blockage but steady flow
        // D 500;  // Slight waviness in the far wake
        D 1000; // Fully shedding behavior

For example the sinusoidal motion of the floating object in the
potentialFreeSurfaceFoam/oscillatingBox tutorial is now specified thus

    floatingObject
    {
        type            fixedNormalInletOutletVelocity;

        fixTangentialInflow false;

        normalVelocity
        {
            type            uniformFixedValue;
            uniformValue    sine;
            uniformValueCoeffs
            {
                frequency 1;
                amplitude table
                (
                    (   0     0)
                    (  10 0.025)
                    (1000 0.025)
                );
                scale     (0 1 0);
                level     (0 0 0);
            }
        }

        value           uniform (0 0 0);
    }

rather than using

    floatingObject
    {
        type            fixedNormalInletOutletVelocity;

        fixTangentialInflow false;

        normalVelocity
        {
            type            oscillatingFixedValue;
            refValue        uniform (0 1 0);
            offset          (0 -1 0);
            amplitude       table
            (
                (   0     0)
                (  10 0.025)
                (1000 0.025)
            );
            frequency       constant 1;
        }

        value           uniform (0 0 0);
    }

    Templated sine function with support for an offset level.

        \f[
            a sin(2 \pi f (t - t_0)) s + l
        \f]

    where

    \vartable
        symbol  | Description       | Data type
        a       | Amplitude         | Function1<scalar>
        f       | Frequency [1/s]   | Function1<scalar>
        s       | Type scale factor | Function1<Type>
        l       | Type offset level | Function1<Type>
        t_0     | Start time [s]    | scalar
        t       | Time [s]          | scalar
    \endvartable

tutorials/compressible/rhoPimpleFoam/ras/angledDuct: Updated for change in U boundary condition update order