Include version-etc.h instead.
(PROGRAM_NAME, AUTHORS): Define.
[long_options]: Add entries for --help and --version.
Remove parse_long_options call.
(main) [getopt switch]: Add a case for each of --help and --version.
[long_options]: Remove the "help" and "version" entries.
(main): Use parse_long_options, including author name(s).
Remove the show_version and show_help blocks.
replace with new variable output_block_size. All uses changed.
(long_options, usage, main): Add --block-size.
(main, decode_switches): Use new human_block_size function to
initialize output block size consistently with other programs.
From Paul Eggert.
("human.h"): Include.
(LONGEST_HUMAN_READABLE, enum Output_units): Remove.
(count_entry): Now returns uintmax_t, not long.
(human_readable_base): Renamed from opt_human_readable; value is now
zero or positive integer, not just zero or nonzero.
(output_units): Now an integer giving output size.
(tot_size): Now uintmax_t, not long.
(long_options, usage): Add --si or -H.
(main): Adjust to renamed option variables.
Use -H if BLOCKSIZE is SI. Add -H.
(human_readable): Remove; rewritten and now in lib/human.c.
(print_size): Rewrite in terms of human_readable.
Accept extra arg to be printed after size; all callers changed.
(enum Output_units): Rename from output_size.
Rename size_* to Unit_*.
Add Unit_variable to correspond to --human-readable.
(convert_blocks): Remove now-unused definition.
(human_readable): Rename paramater n_bytes to n_blocks.
Adjust conversions to reflect fact that input is now number of
512-byte blocks, not bytes.
(print_size): New function.
(du_files): Use print_size instead of open coding it.
(count_entry): Always count in units of 512-byte blocks to delay.
This lets du accumulate totals corresponding to a terabyte before
overflowing 32-bit long int.
Use print_size instead of open coding it.
(du_files): Pass output_size unchanged to convert_blocks. No need
to test output_size for size_bytes, convert_blocks handles that
correctly.
(count_entry): Likewise.
