which provided warning about backward-compatibility issue with setting div
schemes for steady-state.  It caused confusion by generating incorrect warning
messages for compressible cases for which the 'bounded' should NOT be applied to
the 'div(phid,p)'.

Resolves request http://bugs.openfoam.org/view.php?id=2367

Resolves bug-report http://bugs.openfoam.org/view.php?id=2333

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2310

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2309

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2312

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2285

Patch provided by Mattijs Janssens
Resolves bug-report http://bugs.openfoam.org/view.php?id=2240

Patch provided by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2051

Resolves bug-report http://bugs.openfoam.org/view.php?id=2223

  - "$FOAM_USER_APPBIN" and "$FOAM_USER_LIBBIN" have been added to
    "foamOldDirs" in "etc/bashrc" and "etc/config.sh/unset"

  - "$OPAL_PREFIX" is now undefined in the option "SYSTEMOPENMPI" within
    "etc/config.sh/mpi", but only if the path defined in this variable
    is cleaned when using "foamCleanPath".

  - "$OPAL_PREFIX" is now also conditionally undefined in
    "etc/config.sh/unset" when the path is picked up by "foamCleanPath".

Patch contributed by Bruno Santos
Resolved bug-report http://bugs.openfoam.org/view.php?id=2210

surfaceRegion will be the name of a class to provide support for surface
region selection.

Renamed the original volRegion -> volFieldValue to clarify the purpose
of this class to process vol fields on a volRegion.

The change from C++0x to C++11 allows all of C++11 functionality to be
used in OpenFOAM, in particular constructor delegation which avoids code
duplication or constructor helper functions.  However, this also means a
change to the minimum gcc version supported which is now 4.7 rather than
4.5.

Note that gcc-4.7 does not support the entire C++11 standard but does
support all of the functionality currently needed for further OpenFOAM
development.  The minimum gcc-version which supports the entire C++11
standard is 4.8 which is now the recommended minimum gcc version.

functionObjects::XiReactionRate: Writes the turbulent flame-speed and reaction-rate volScalarFields for the Xi-based combustion models

Replaces the obsolete and 'wdot' utility.

postProcess -func writeCellCentres

being filled with cellLevel files, which generally breaks workflows

Instead of ICCG use PCG with the DIC preconditioner
Instead of BICCG use PBiCG with the DILU preconditioner

Replaced the 'postProcess' argument to the 'write' and 'execute'
functions with the single static member 'postProcess' in the
functionObject base-class.