To add a codeset:

1)  modify harvest data

    add data at the top

    modify do_TYPE function

    add functions named:
       _init_TYPE_SRC
       _read_TYPE_SRC

2)  modify data.TYPE.pl

    add a new section

    if there are non-ASCII names, add them to:
       $Data{TYPE}{SRC}{orig}{name}
    Otherwise you'll see warnings 'NON-ASCII'

    if there are new names in this list (except for the first codeset
    of a given TYPE), they must be explicitly allowed by adding them
    to:
       $Data{TYPE}{SRC}{new}
    or:
       $Data{TYPE}{SRC}{orig}{name}
    Otherwise you'll see warning 'new name not allowed'

3)  modify lib/Locale/Codes/Constants.pm

    Public Global Variables:
       @EXPORT

    Constants:
       use constant
       $ALL_CODESETS

4)  modify lib/Locale/Codes/TYPE.pod

       Supported code sets
       SEE ALSO (cite source)