notations like thousands separators.
Specify what includer of include.h must include beforehand.
(human_group_digits, human_suppress_point_zero, human_autoscale,
human_base_1024, human_SI, human_B): New enum values.
(human_readable): Rename from human_readable_inexact; put the
options before the sizes. All uses changed. The old human_readable
function has been removed; use inttostr.h instead.
(human_options): Renamed from human_block_size, with new signature
that allows block sizes up to UINTMAX_MAX. All callers changed.
(humblock): Use it if no block size is specified.
(human_block_size): If the specified block size is zero, report an
error if report_errors is nonzero; otherwise use the default.
into one, for convenience. All callers changed.
(human_block_size): New function.
* lib/human.c: Include <config.h> only if HAVE_CONFIG_H.
Include <stdlib.h> if HAVE_STDLIB_H;
declare getenv unless HAVE_DECL_GETENV.
(_): New macro.
Include <argmatch.h>, <error.h>, <xstrtoul.h>.
(DEFAULT_BLOCK_SIZE): New macro.
(block_size_args, block_size_types): New constants.
(humblock): New function.
