efficient by removing the need for a MAXPATHLEN buffer on the
stack of delete_item().

in the flist (which was changed to a countdown of files to check)
so that it's clearer what the numbers mean.

recursion by eliminating the need for a MAXPATHLEN buffer in
send_if_directory().  Also improved a few variable names in
send_file_list().

- Added an error message to wait_process_with_flush() that
  reports the errno we get when waitpid() fails.
- Increased the value of MAXCHILDPROCS.

request info and puts that into the environment as RSYNC_REQUEST.

and used it in the new wait_process_with_flush() function (the old
function's new name).  Made wait_process() public.

preserve the first /./ dir so that we can use its position to
trim the implied directories.

if the option is combined with --ignore-existing.

instead of --existing.