* MCCS translations for strings passed to/from UNIX-GETENV and other system interfaces.
* INTERPRET.REM.CM assumes system external format is UTF-8. ISO8859/1 external format is defined in MCCS as a dummy for UTF-8 until UNICODE is loaded
* Add string translation interface to EXTERNALFORMAT datatype,
* Set the external format of the default reader environment to *DEFAULT-EXTERNALFORMAT* = :MCCS
* Add external format :THROUGH16 for 16 bit codes, used by linebuffer