Updated tutorials

Description
    Specify an etc file to include when reading dictionaries, expects a
    single string to follow.

    Searches for files from user/group/shipped directories.
    The search scheme allows for version-specific and
    version-independent files using the following hierarchy:
    - \b user settings:
      - ~/.OpenFOAM/\<VERSION\>
      - ~/.OpenFOAM/
    - \b group (site) settings (when $WM_PROJECT_SITE is set):
      - $WM_PROJECT_SITE/\<VERSION\>
      - $WM_PROJECT_SITE
    - \b group (site) settings (when $WM_PROJECT_SITE is not set):
      - $WM_PROJECT_INST_DIR/site/\<VERSION\>
      - $WM_PROJECT_INST_DIR/site/
    - \b other (shipped) settings:
      - $WM_PROJECT_DIR/etc/

    An example of the \c \#includeEtc directive:
    \verbatim
        #includeEtc "etcFile"
    \endverbatim

    The usual expansion of environment variables and other constructs is
    retained.

Use the new -withFunctionObjects command-line option to execute functionObjects

Pe: Create and write volScalarField in addition to the surfaceScalarField for ease of post-processing
Update handling of turbulence models

This allows checkMesh and other mesh manipulation utilities to operate
on the mesh without any time directories being present.

To include 0 use the -zeroTime option

For multi-region cases the default location of blockMeshDict is now system/<region name>

If the blockMeshDict is not found in system then the constant directory
is also checked providing backward-compatibility

Provided by Timo Niemi
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1650

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1665

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

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1641

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1650

Note that currently when transportProperties is changed sigma is re-read
from this dictionary but cAlpha is read from fvSolution but cAlpha is
not re-read when fvSolution is changed but transportProperties is not
touched.  To avoid this problem cAlpha would need to be moved to the
transportProperties dictionary which is not ideal or moved out of the
interfaceProperties class back to the top-level solver.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1657

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

Updated tutorials to converge pressure during PIMPLE loop to avoid
phase-fraction unboundedness which limits thermodynamics convergence.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1649

twoPhaseEulerFoam/interfacialModels/turbulentDispersionModels/noTurbulentDispersion: Corrected dimension of D

twoPhaseEulerFoam/interfacialModels/turbulentDispersionModels/Burns: Corrected sign of the diffusivity

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1653
Thanks to Armin Wehrfritz for proposed fixes

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1650
Thanks to Timo Niemi

This allows for more than one of these data types to be specified in a dictionary
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1652

e.g.
        <entryName> csvFile;
        <entryName>Coeffs
        {
            nHeaderLine         4;
            refColumn           0;          // reference column index
            componentColumns    (1 2 3);    // component column indices
            separator           ",";        // optional (defaults to ",")
            mergeSeparators     no;         // merge multiple separators
            fileName            "fileXYZ";  // name of csv data file
            outOfBounds         clamp;      // optional out-of-bounds handling
            interpolationScheme linear;     // optional interpolation scheme
        }

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1650

Reduces or eliminates staggering patterns due to cell-force imbalances
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1363

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.