reactingEulerFoam: Updated handling of thermal diffusivity to support Prandtl number and thermal wall-functions

Now consistent with constructors.

to allow the turbulent energy transport properties to be updated for
every energy solution if required.

Added correctEnergyTransport() call to reactingTwoPhaseEulerFoam

so that the specification of the name and dimensions are optional in property dictionaries.

Update tutorials so that the name of the dimensionedScalar property is
no longer duplicated but optional dimensions are still provided and are
checked on read.

Also removed __GNUC__ conditional compilation statements which are no
longer needed.

construction of the phases is not complete

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1745

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1741

if it depends on the availability of the physical properties of both
phases as the construction of the phase-system may not be complete.

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1704

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1696

Resolved part of bug-report http://www.openfoam.org/mantisbt/view.php?id=1690

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1673

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1659

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1658

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1638

mixtureKEpsilon: Changed bounded non-conservative transport flux to be volumetric rather than mass-based
Avoids numerical problems caused by large density gradients, particularly around the interface.
Allows the use of higher-order differencing for km and epsilonm

Added the pressure dependent part of the entropy from the equation of
state to that returned by the thermo entropy function.

TODO: Add entropy defect to the PengRobinsonGas::s(p, T) function.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1411

The implementation now correspond to the definitions in the readily
available reference:

http://personalpages.manchester.ac.uk/staff/david.d.apsley/specturb.pdf

in which a large number of linear and non-linear models are presented in
a clean and consistent manner.  This has made re-implementation and
checking far easier than working from the original references which anyway
are no longer available for the LienCubicKE and ShihQuadraticKE models.

Also use the innerSqr function where appropriate