and pre-construct constant strings and names

Speeds-up parsing of DTAGS so that lookup of a name takes ~1s

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=982

Patch provided by Armin Wehrfritz
Resolves feature request http://www.openfoam.org/mantisbt/view.php?id=843

This change ensures that these patches are named consistently so that
they can be looked-up as required in e.g. patchMeanVelocityForce

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=992

    ln(mu) = sum_i=1^N(a[i]*ln(T)^(i-1))
    ln(kappa) = sum_i=1^N(b[i]* ln(T)^(i-1))

Based on patch provided by Armin Wehrfritz

Resolves feature-request http://www.openfoam.org/mantisbt/view.php?id=978

    If the mean velocity force is applied to a cyclic patch for parallel
    runs include contributions from processorCyclic patches generated
    from the decomposition of the cyclic patch

    When restarting form a previous calculation, the averaging is continuous or
    may be restarted using the \c restartOnRestart option.

    The averaging process may be restarted after each calculation output time
    using the \c restartOnOutput option or restarted periodically using the \c
    periodicRestart option and setting \c restartPeriod to the required
    averaging period.

    Example of function object specification:
    \verbatim
    fieldAverage1
    {
        type fieldAverage;
        functionObjectLibs ("libfieldFunctionObjects.so");
        ...
        restartOnRestart  false;
        restartOnOutput   false;
        periodicRestart false;
        restartPeriod   0.002;
        fields
        (
            U
            {
                mean            on;
                prime2Mean      on;
                base            time;
                window          10.0;
                windowName      w1;
            }
            p
            {
                mean            on;
                prime2Mean      on;
                base            time;
            }
        );
    }
    \endverbatim

    \heading Function object usage
    \table
        Property        | Description           | Required    | Default value
        type            | type name: fieldAverage | yes |
        restartOnRestart  | Restart the averaging on restart | no | no
        restartOnOutput   | Restart the averaging on output | no | no
        periodicRestart | Periodically restart the averaging | no | no
        restartPeriod   | Periodic restart period | conditional |
        fields          | list of fields and averaging options | yes |
    \endtable

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1982

in decomposeParDict.

This default number of processors may be overridden by the new "-np"
option to runParallel which must be specified before the application
name e.g.:

runParallel -np 4 pisoFoam

which may be optionally overridden by version-specific rules.

For example the default rules for gcc on GNU/Linux x86_64 are in the
wmake/rules/linux64Gcc directory.  If there is a need to change any of
the rules for a specific version of gcc, e.g. gcc-4.8.4 the directory
wmake/rules/linux64Gcc48 may be created into which any of the language
files may be provided containing the rules to override the defaults.

when building ThirdParty packages.
c++0x is used rather than c++11 to support gcc-4.5.?

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1977

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1978

Optional under-relaxation is provided for steady-state solution.
Added missing fvOptions.constrain and fvOptions.correct calls.

Based on patch provided by Alexey Matveichev
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1975

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1974

Always return void to avoid various bugs associated with automatic
type conversion.

Resolves request http://openfoam.org/mantisbt/view.php?id=1973

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1971

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1972

reactionThermo/functionObjects/moleFractions/moleFractions: New functionObject to calculate and write mole-fraction fields

    This function object calculates mole-fraction fields from the mass-fraction
    fields of the psi/rhoReactionThermo and caches them for output and further
    post-processing.

    The names of the mole-fraction fields are obtained from the corresponding
    mass-fraction fields prepended by "X_"

    Example of function object specification:

        moleFractions
        {
            type psiReactionThermoMoleFractions;
        }

     or

        moleFractions
        {
            type rhoReactionThermoMoleFractions;
        }

    depending on the thermodynamics package used in the solver.