Require nntp instead of gnus and message.

Require nntp instead of gnus and message.
Set euc-kr for newsgroup "han".  Delete code for add-hooking
gnus-mule-initialize and setting coding system for nntp.
Set default coding system for encoding to
iso-latin-1.
(gnus-mule-select-coding-system): Get a coding system of the
current newsgroup from gnus-summary-buffer.
(gnus-mule-decode-summary): Deleted.
(gnus-mule-initialize): Add-hook gnus-mule-select-coding-system to
gnus-parse-headers-hook.  Don't add-hook gnus-mule-decode-summary
and gnus-mule-decode-article.  Don't set process coding system for
nntp stream to 'no-conversion, instead set
nntp-coding-system-for-read to 'binary.  Set
nnheader-file-coding-system and nnmail-file-coding-system to
'binary.
Set nntp-coding-system-for-write to
binary.