like cp).

reason other than the destination does not exist, mention the
error and exit.

due to timing tests showing that the per-byte modulus calculation
slowed down regular sized files.  Kept the other improvements
because they lessened our memory use and actually sped up the code.

  need for it.
- Fixed a really old bug in the verbose output where it would output
  the wrong sum value (off by one).
- Renamed the tag_hit variables & debug output to hash_hit.

work better with large files.  I further modified it to eliminate
the extra level of indirectness (and the qsort()), which saves
memory.

with an error.

- Improved the docs for --no-implied-dirs and --keep-dirlinks
  (based on a patch from Matt).
- Improved a few other misc. sentences.
- Shuffled the order of a couple options.

affect the delete scan).

- Added support for copy_dirlinks.
- Fixed a bug where --copy-links would not affect implied dirs
  unless --copy-unsafe-links was also specified.

portion of the filename's path.

arg.

- Use CHMOD_BITS instead of 07777.

has nothing to do with option settings.

- Define orig_umask in this file, not options.c.
- Made orig_umask a mode_t, not an int.

+ Changed create_directory_path() to drop the (now) unneeded
  base_umask arg and to call mkdir_defmode().

until a regular file is found in the current parent directory.