regionFunctionObject: moved 'log_' to public 'log' to support the 'Log' macro

simpleControl: Change the number of steps printed to be relative to the current time (for restarts) rather than 0
Resolves feature-request http://bugs.openfoam.org/view.php?id=2096

regionFunctionObject: Moved the field/object maintenance functions from fvMeshFunctionObject into regionFunctionObject

functionObjects: Clear the result field from the objectRegistry if the argument fields are not available
This is needed to handle the processing of many time directories, some
of which may have the required fields and some not.

of a compressible single-phase flow

See tutorials/compressible/sonicFoam/laminar/forwardStep/system/controlDict

functionObjects::flowType: new functionObject which calculates and writes the flowType of velocity field

    The flow type parameter is obtained according to the following equation:
    \verbatim
                 |D| - |Omega|
        lambda = -------------
                 |D| + |Omega|

        -1 = rotational flow
         0 = simple shear flow
         1 = planar extensional flow
    \endverbatim

DimensionedScalarField, GeometricScalarField: Added more rigorous dimension-checking for 'pow' functions

to return unchanged 'tmp' arguments

functionObjects::Peclet -> functionObjects::PecletNo for consistency with functionObjects::CourantNo

const-ness of the stored object is checked at run-time.