2000-10-12 Ed Avis <epa98@doc.ic.ac.uk>
Release 1.04
Catch errors from recode better, support identity mappings
1997-09-19 Gisle Aas <aas@sn.no>
Release 1.03
Support strict_ versions of the mapping functions.
Prototype the mapping functions to take a single scalar argument.
1997-09-18 Gisle Aas <aas@sn.no>
Release 1.01