(archive-file-name-coding-system): New variable.

(archive-file-name-coding-system): New variable.
Make it permanent-local.
(byte-after, bref, insert-unibyte): New function.  Change most of
char-after, aref, insert to them respectively.
(archive-mode): Set archive-file-name-coding-system.
(archive-summarize): Don't change the buffer's multibyteness.
(archive-extract): Inherit archive-file-name-coding-system from
archive-superior-buffer.  Bind coding-system-for-write to
archive-file-name-coding-system.
(archive-*-write-file-member): Encode ENAME by
archive-file-name-coding-system.  Bind coding-system-for-write to
no-conversion.
(archive-rename-entry): Encode the filename by
archive-file-name-coding-system.
(archive-mode-revert): Don't change the buffer's multibyteness.
(archive-arc-summarize, archive-lzh-summarize,
archive-zoo-summarize): Don't change the buffer's multibyteness.
Decode filenames by archive-file-name-coding-system.
(archive-arc-rename-entry, archive-zip-chmod-entry): Don't change
the buffer's multibyteness.