the challenge string base64-encoded (instead of forcing the caller
to handle this).  Also improved a couple comments.

- Don't define SUPPORT_HARD_LINKS unless HAVE_LINK is defined.

  (with appropriate negation).
- If write_batch is < 0, we write out the file-transfer data to
  just the batch file, not the socket.

  (with appropriate negation).
- If we get a transfer when write_batch is < 0, discard it.

(with appropriate negation).

  now that write_batch is no longer forced to 0 for the server).
- If write_batch is < 0, force "dry_run = 1" (but only after we've
  finished any appropriate write-batch file creation).

- Handle the new --only-write-batch=FILE option.

changing --write-batch).

- Don't log an auth-failed error -- auth_server() now handles that.

- Pass the hostname in to auth_server().
- Generate a unique error for each failure type in auth_server() so
  that the log-file contains why the authorization failed.
- Don't use sscanf() to parse the client's auth-challenge response.

the right value.

token.

- Always maintain the last_io value for the generator.

temporary output (it used to always be covered up by output in
older versions, but it might be followed by a newline in newer
versions).

in order to avoid confusion with the bind_address global.

enough to handle long-filename messages on a system that has a
really short MAXPATHLEN value.  Also, make it large enough to
be able to comment on a MAXPATHLEN filename.

variable when we're ignoring msg_fd_in.

or --link-dest file be output as a 'c' (local change) when itemizing
or as transfered file when not itemizing.

- Conditionally call setlocale(LC_CTYPE, "").

- Look for setlocale(), locale.h, and honor --disable-locale.

characters (not ?) and \\ to escape \ itself.

This fixes a crash in the exclude code when chroot is off.