(print_long_format, print_file_name_and_frills):

(print_long_format, print_file_name_and_frills):
Use primitives from inttostr.h, not
human.h, to print large numbers simply.

(human_output_opts): New var.
(output_block_size): Now uintmax_t, not int, to handle larger
block sizes.  All uses changed.

(file_output_block_size): New var, to distinguish
file sizes from other sizes.
(decode_switches): Set it.