- both versions handle the same input words.
  Only need the <Switch> version when the destination variable is
  also a Switch and we need to output the word later.

equivalent to the 'none' entry in fvSchemes and relaxation factors must be
provided for all fields which might require one.  If it is set to a value
between 0 and 1 this value is used as the default relaxation factor.

  - can now use dictionary substitutions and regular expressions in
    system/fvSolution

  - foamUpgradeFvSolution application to convert system/fvSolution
    (with -test option)

motion solver syntax left as-is.