Improves stability and convergence of systems in which drag dominates
e.g. small particles in high-speed gas flow.

Additionally a new ddtPhiCorr strategy is included in which correction
is applied only where the phases are nearly pure.  This reduces
staggering patters near the free-surface of bubble-column simulations.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1112

Thanks to Bruno Santos for analysing and fixing this
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1633

Roselves bug-report http://www.openfoam.org/mantisbt/view.php?id=1581

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

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1637

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1421

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1024

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=815

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

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1579

Also changed internalDegreesOfFreedom to be an integer type

Also corrected names of other fields

to avoid excessive pressure/buoyancy balance errors on non-orthogonal meshes

twoPhaseEulerFoam JohnsonJacksonFrictionalStress: alphaDeltaMax now user input (previously hard-coded to 5e-2)

to avoid excessive pressure/buoyancy balance errors on non-orthogonal meshes
Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1379

Allows the specification of a reference height, for example the height
of the free-surface in a VoF simulation, which reduces the range of p_rgh.

hRef is a uniformDimensionedScalarField specified via the constant/hRef
file, equivalent to the way in which g is specified, so that it can be
looked-up from the database.  For example see the constant/hRef file in
the DTCHull LTSInterFoam and interDyMFoam cases.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1573

Avoids unnecessary increases in precision during intermediate steps for
cases with adjustable time-step which may require very high precision to
represent the time name.

Add check for round-off error causing time reversal
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=815

Disadvantage is that the BC values have to be specified in terms of hU
rather than U.  The alternative would be to add complex code to map h
and U BCs into the equivalent for hU.
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1566

This reverts commit 41b93482.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1568

Note that in order to build and install ParaView-4.3.1 lines 653-656
must be removed or commented from file

ThirdParty-dev/ParaView-4.3.1/Qt/Components/CMakeLists.txt

after unpacking the ParaView-4.3.1 source-pack from KitWare.  This is
because the file ui_pqExportStateWizard.h referred to in the lines
653-656:

if(PARAVIEW_INSTALL_DEVELOPMENT_FILES)
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ui_pqExportStateWizard.h"
          DESTINATION "${VTK_INSTALL_INCLUDE_DIR}")
endif()

does not exist and cannot be installed causing the build and
installation to fail.

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1548

Correction provided by Juho Peltola

This reverts commit 0a6395b6.

This reverts commit 991819bb.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1563