(mode4350): Moved from `src/dosfns.c' for backward compatibility.
(convert-standard-filename): Preserve ~ as last char.
(convert-standard-filename): Don't do anything if the
argument is empty, or isn't a string; leave alone characters with
ASCII codes above 127 and special characters legal in DOS filenames.
duplicate defvar is a bad idea.
(dos-printer): New variable, the local printer device.
(dos-print-region-function): New function, used for `print-region-function'.
(dos-ps-printer): New variable; if a string, it's the name of the
local printer device.
(ps-lpr-command, ps-lpr-switches): Set them properly for Ghostscript.
(lpr-headers-switches): Set to non-nil, to disable page headers'
support under MS-DOS.
register trashed the low byte.
(set-register-value): Fixed test so the value 0 can be set.
(set-register-value): Rewrote to use bit operations instead of
multiplication and division.
(register-name-by-word-alist, register-name-by-byte-alist):
Combined into one list, register-name-alist.
(register-value, set-register-value): Use combined list.
(mode-line-format): Make the %n pure.
