(find-binary-process-coding-system, find-buffer-file-type-match):
New functions.
(find-buffer-file-type): Use find-buffer-file-type-match.
Add find-buffer-file-type-coding-system to file-coding-system-alist
as the default entry.
Add find-binary-process-coding-system to process-coding-system-alist
as the default entry.