Display coding systems currently used in a brief format in echo area.
The format is "F[..],K[..],T[..],P>[..],P<[..], default F[..],P<[..],P<[..]",
where mnemonics of the following coding systems come in this order
in place of `..':
`buffer-file-coding-system' (of the current buffer)
eol-type of `buffer-file-coding-system' (of the current buffer)
Value returned by `keyboard-coding-system'
eol-type of `keyboard-coding-system'
Value returned by `terminal-coding-system'.
eol-type of `terminal-coding-system'
`process-coding-system' for read (of the current buffer, if any)
eol-type of `process-coding-system' for read (of the current buffer, if any)
`process-coding-system' for write (of the current buffer, if any)
eol-type of `process-coding-system' for write (of the current buffer, if any)
default `buffer-file-coding-system'
eol-type of default `buffer-file-coding-system'
`default-process-coding-system' for read
eol-type of `default-process-coding-system' for read
`default-process-coding-system' for write
eol-type of `default-process-coding-system'
(fn)