documented a standard way to do it.
(skip_bytes, seek_bytes): Remove.
(usage): Remove B suffix.
(scanargs, skip, dd_copy, main): Remove support for B suffix.
e.g. 64-bit Solaris (sparc).
("human.h", "xstrtol.h"): Include.
(struct line): length member is now size_t, not int.
(struct lines): Likewise for used, alloc, limit members.
(struct buffer): Likewise for used, alloc, left, newline_free members.
(struct keyfield): Likewise for sword, schar, eword, echar members.
(sortalloc, mergealloc, linelength): Now size_t, not int.
(initbuf, fillbuf, initlines, begfield, limfield, findlines,
numcompare, getmonth, keycompare, compare, checkfp, mergefps,
sortlines, sort): Accept, return, and use size_t for sizes, not int.
(fillbuf, initlines, findlines, checkfp, sort): Check for overflow
when computing buffer sizes.
(begfield, limfield): Do not index past end of array.
(checkfp): Return a boolean, not a line number, as the line
number may not fit in int. All callers changed. Use
uintmax_t for line numbers, not int.
(sort): Don't allocate tmp until we need it (and know the right size).
(parse_field_count): New function.
(main): Use it to check for overflow in field counts.
"outfile" is now a pointer to const.
(seek_records): Renamed from seek_record, for consistency with
skip_records and max_records. All uses changed.
(usage, scanargs): Remove bseek=n and bskip=n; instead, use seek=nB
and skip=nB.
(enum Unit, Unit): Remove.
(skip, dd_copy, main): Undo most recent change.
(dd_copy, main): Pass blocksize of 1 as appropriate when
skip_bytes or seek_bytes is nonzero.
(main): Rework ftruncate failure diagnostic to always use byte count.
