BUG: When cloud is inactive, the transient flag needs to be read to avoid default value false and the unnecassary massFlowRate input

BUG: forces/forceCoeffs - corrected behaviour for case that input fields are not available.  Fixes #107

ENH: Adding option for closing or opening wall/cyclic double baffle in activePressureForceBaffleVelocityFvPatchVectorField

bugFixes- various issues

#101 
#21 
#46 

See merge request !32

Old:
- Previous versions created k and epsilon fields by default, and
  then processed omega and nuTilda fields if present.
- Depending on the choice of turbulence model, not all of these fields
  would be used, and could lead to errors when running some utilities
  due to erroneous values.
- If the omega field did not exist, it would be derived from the epsilon
  field, and also inherit the epsilon boundary conditions (wall
  functions)

New:
- This version will only update fields that already exist on file, i.e.
  will not generate any new fields, and will preserve the boundary
  conditions

ENH: Changing header information in turbulentTemperatureCoupledBaffleMixedFvPatchScalarField & turbulentTemperatureRadCoupledMixedFvPatchScalarField

ENH: Adding new trubulent constructor for buoyantBoussinesqPimpleFoam and buoyantBoussinesqSimpleFoam

Fixed #55.