- Got rid of FNONE from logcode enum.
- Created msgcode enum with MSG_DATA, MSG_REDO, MSG_DONE, etc.

- Use new send_msg() call with MSG_DONE or MSG_REDO.

- Got rid of the recv_pipe between the receiver and the generator.
- Use new send_msg(MSG_DONE,...) call to signal the generator
  when the receiver is done.
- Use the new get_redo_num() call in the generator to read the
  final -1 from the receiver.

- Call the new send_msg() function to send a remote log message.

- Renamed log_error_fd to msg_fd_out, and io_error_fd to msg_fd_in.
- Added a redo_list* to keep track of any redo items that come over
  the message channel from the receiver to the generator.
- The io_flush() and msg_list_push() functions now take an arg:
  NORMAL_FLUSH or FULL_FLUSH.  The latter ensures that we don't lose
  any log messages that haven't gotten written from the msg_list.
- Added a send_msg() function that log.c calls to send any remote
  log messages.  It is also called to send the new MSG_REDO and
  MSG_DONE messages.

the error now says that chgrp failed, not chown.

and no permissions to set group 0.

when using --progress.

right spot, and moved some externs.

require any binary searching of hlink data.

to output the "filename" value when it might not be initialized.

preliminary patch by J.W.

mutually exclusive based on mode).  Based on an idea by J.W.

receive_file_entry().

send_file_entry() and receive_file_entry().  Other cleanups too.

called by the batch processor.