Enable readfile() and add peek() and poke() functions.
Stat cleanup.

Put global stat info in a union so we don't have to malloc it and thus don't need an explicit size tracked in main(). Make date_stat_format() take a timespec and take advantage of stat having an embedded timespec (nanosecond printing), typecast the long long prints for XYZ because on some 32 bit platforms it's an int.
Add peek/poke to header file.
Stat cleanup.

lib: rename format_mode() to mode_to_string() (echoing string_to_mode), make it
take a normal char * argument.

stat: collapse big switch/case statements that only have one line each
into if/else staircase (much fewer lines of code). Remove return type
(other stat implementations print ? for unknown escapes, so do that here).
Inline do_stat() and do_statfs(). Set default string in normal local
variable "format". Remove unnecessary struct d. Restructure stat logic to
"if (flagf && !statfs()) else if (!flagf && !stat()) else perror_msg();"
Teach %N to add -> symlink. Judicious use of putchar() instead of xputc to
let FILE * do its job collating output.
Stat cleanup.

Move ftname out of GLOBALS into 'F' handler. Make 'i' zero pad output (zeroes
in middle of ID can get lost).
Move stat from pending to other, default y.
More ifconfig cleanup, described on list.