old time field being read in postprocessing
During post processing it reads the contents of the directory e.g. as volFields. There is no need to automatically read the old-time field as well. This is just an efficiency issue.
Steps to reproduce
Use e.g. setFields. Copy a field to make an old-time one:
cp zoneID zoneID_0
Switch on debug flag for
volScalarField and run
setFields with relevant
setFieldsDict. It shows loading the old-time field.