- Renamed read_line() to be read_line_old().

- Renamed read_filesfrom_line() to read_line() and added args to allow
  the caller to control how it works.
- Added a new function, read_args(), that reads args from a file
  descriptor (using read_line()) and expands any wildcards in them.
  This function has relocated daemon code (from clientserver.c) and
  is also used by the new --protect-args (-s) option.  The new code
  also got rid of an extra strdup() that wasn't needed.