Extended the fieldAverage FO to include an 'exact' windowing method.
In earlier versions the window option generated a pseudo/approximate window average. The type must now be specified by the
windowType entry, e.g. for backwards compatibility, use :
and for the new
exact window average
Note that the
exact method requires all instances of the field to be cached within the windowing interval, leading to increased memory usage, and also need to be written to enable a clean restart. To suppress writing of all intermediate field files (disabling smooth restart) use the option