- the basic idea is to automatically select all of the volume fields
  that have a "AUTO_WRITE" characteristic (which would normally be
  managed by the object registry) and do this for all regions.

  Works for multiRegionHeater without too many dictionary entries:

functions
{
    adiosData
    {
        type            adiosWrite;
        region          topAir;    // required for function-object to work
        writeInterval   5;
        autoWrite       true;

        functionObjectLibs  ( "libIOadiosWrite.so" );

        // writeMethod     MPI;
        // writeParams     "";
    }
}

Additional fields are currently specified by the 'objectNames ( )'
entry, but this will be streamlined in the future.

ENH: rationalize naming for general and time values

- /openfoam/... for general values
- /time/... for time values

Use leading '/' to ensure no clash with region or cloud names etc.