This scalar allows to introduce a factor for cloudy sky between 0 (clear) and 1 (fully cloudy)

Use subDict for changeDictionary, Fixes #409

Closes #409

See merge request !95

ENH:Delete 'not Implemented' function updateCoeffs() in slicedFvPatchField. ACMI patch is used with mesh.C() in isoSurface
which uses slicedFvPatch.

- makes it easier to switch between mpi implementations (eg, openmpi, intelmpi etc)

- add comment about compiler setting for KNL

boundaryRadiationProperties: updating to new format
dynamicMeshDict and snappyHexMeshDict in utorials/multiphase/interDyMFoam/RAS/motorBike to follow Mattijs Git lab id 381

BUG: noise - updated creation of control dictionary to allow -case option and env variables.  Fixes #402

adding viewFactorWall to inGroups fixes #384

@Sergio

See merge request !91

Enhancements

- introduce intermediate layer for base64 foamVtk formatting
- add encodedLength() method, which is useful for xml appended output

- misc improvements in functionality.

- no reason to use post-increment in forAll() macro.

- use C++11 cbegin()/cend() method names for forAll*Iter() macros.
  These method names have been in OpenFOAM since 2009 and are also
  used by C++11 containers.

STYLE: nullptr instead of 0 in UList

Examples,

    wmakePrintBuild -plus

Check if value is known
(ie, everything configured and also OpenFOAM+):

    if wmakePrintBuild -plus >/dev/null 2>&1
    then
        echo YES
    else
        echo NO
    fi

Check if version is new enough

    if ofver=$(wmakePrintBuild -plus 2>/dev/null) && [ "$ofver" -ge 1612 ]
    then
        echo YES
    else
        echo NO
    fi

Conditionals

    ofver=$(wmakePrintBuild -plus 2>/dev/null)
    case "${ofver:=0}" in
    1612)
        echo "something for 1612
        ;;
    1706)
        echo "something for 1706
        ;;
    esac

- makes it easier to use as a wordHashSet replacement for situations
  where we want to avoid duplicates but retain the input order.

- support construction from HashTable, which means it works like the
  HashTable::sortedToc but with its own hashing for these keys.

- expose rehash() method for the user. There is normally no need for
  using it directly, but also no reason to lock it away as private.