Status for a particular file.
An entry exists in this table for each time cbfDefineFileNow
has been set to 'create' and the corresponding entry here
has not been explicitly deleted by the application or bumped
to make room for a new entry.
Deleting an entry with cbfStatusFileState 'running' aborts
the file creation attempt.
It is implementation and file-system specific whether deleting
the entry also deletes the file.