Correct writing to database files with different field ordering

[thawes-rse]

Setup: create a database csv file with fields ordered with a certain ordering. Initialise a CsvDB instance on the csv file and with the fields ordered differently. The create a record with the instance.

Should see: the record is recorded to the csv file with the field values correctly aligned to the order of the fields in the file.

Actually see: the fields values are written to the csv file ordered according to the ordering given at initialisation.