-  base64(+Plain, -Encoded) is det
 
- base64(-Plain, +Encoded) is det
 - Equivalent to base64_encoded/3 using the options 
as(atom) and
encoding(iso_latin_1).
- deprecated
 - - New code should use base64_encoded/3. Notably the
iso_latin_1 should be utf8 in most today's applications.