- Allow spaces and a few other extra chars in file names.
- For safety, disallow any option that takes an arg.  This should
  be improved in the future because it blocks options such as
  --block-size=N, but without this rule the user could specify
  something like --files-from=FILE or --backup-dir=DIR and have
  it affect files outside the desired SUBDIR restriction.
- Switched to SSH_CONNECTION from the deprecated SSH_CLIENT.
- Strip "::ffff:" from the start of an IP from SSH_CONNECTION.

TEST_MDFOUR is defined:  it did not have the fix that the main
rsync code got back in protocol 27 to properly handle files
that are a multiple of 64-bytes long.

  create a backup file if we're about to overwrite the basis file.
- Only clear make_backups for the redo phase if partial_dir isn't set.

(this message comes from the receiver).  This ensures that any
redo-pass files and delete-after processing are known to be done
prior to the start of our hard-link and dir-time-munging loops.

generator.c (the message comes from the receiver).  This ensures
that any redo-pass files and delete-after processing are known to be
done prior to the start of the hard-link and dir-time-munging loops.

chown-follows-symlinks check to "yes".

symlink if it will try to follow the symlink (as a normal OS should).

- Check for getpgrp() and tcgetpgrp().

call to deflate(..., Z_INSERT_ONLY) -- the underlying bug was
caused by the zlib code not handling Z_INSERT_ONLY in the case
where the server has disabled compression.

now breaks up the calls to deflate() into CHUNK_SIZE chunks, just
like the other sections of the code.

- Fixed a problem in send_deflated_token() where the data we are
  compressing might not finish processing in one call.

- Fixed a potential overflow in the map_size calculation.

- Improved the layout and error-checking of the code that
  calculates the block-size and the number of checksum bits.

- Renamed the local block_size arg to blk_size (to avoid
  confusion with the global block_size variable).

- Simplified some of the code, removing a useless memcpy().

an empty string and ignore it when it is.

exit situation was properly forcing the io_timeout value down to 30
seconds, but failing to set the select_timeout value.

the default select_timeout value.

are not enabled, we need to also send --no-relative.

symlinks that are being copied, even if they point nowhere.