and two-phase functionality separated from multiphase functionality

Patch provided by Bruno Santos
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1826

Resolved bug-report http://openfoam.org/mantisbt/view.php?id=1831

Includes many contributions from Juho Peltola

Patches provided by Bruno Santos
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1832

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1816

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1794

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1803

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1805

to simplify construction of dimensionedScalar properties and avoid the
duplication of the name string in the constructor call.

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.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1788

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

The interfacial temperature is assumed equal to the saturation
temperature.  Only a single species is considered volatile and the other
species to not affect the mass-transfer.

Added calls to setFluxRequired for p, p_rgh etc. in all solvers which
avoids the need to add fluxRequired entries in fvSchemes dictionaries.

Added calls to setFluxRequired for p in all incompressible solvers which
avoids the need to add fluxRequired entries in fvSchemes dictionary.

Will add calls to setFluxRequired to the rest of the solvers.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1787

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1773

Currently this is implemented only for the Antoine equation, for the
other more complex models an iterative inversion from pressure to
temperature is required.

In preparation for adding the Tsat function

for consistency with the evaluation of the interface temperature.

Generally this term has a VERY small effect on temperature, it is only
important for low-speed buoyancy-dominated flows.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1755

See also http://cfd.direct/openfoam/energy-equation/