Added support for collecting stderr of a spawned program via a pipe.

ChangeLog

 2003-10-24  Per Cederqvist  <ceder@ceder.dyndns.org>
 
+	Added support for collecting stderr of a spawned program via a
+	pipe.
+	* pcl_expect/spawn.py (_spawn): New helper function, extracted
+	from Spawn.__init__.  New argument: use_stderr_pipe.
+	(Spawn.__init__): New optional argument: use_stderr_pipe.  Set the
+	stderr attribute to an Expectable object that represents the
+	stderr output from the subprocess it it is true.  Get rid of the
+	__pty attribute, and renamed __child to __child_pid.
+	(Spawn.send): Use self.fileno() instead of self.__pty.
+	(Spawn.close): Ditto.  Close the stderr pipe if present.
+	(spawn2): New function.  A possibly easier API if you want to
+	have the stderr output in a separate Expectable.
+	* demo/stdout.py: New demo program.  Run a subshell in a pty.
+	* demo/stderr.py: New demo program.  Run a subshell in a pty, but
+	with stderr connected to a pipe.
+	* README: Mention that pcl-expect can collect stderr of a spawned
+	program via a pipe.
+
 	Added TCP support.
 	* README: TCP support is now implemented.
 	* pcl_expect/tcp.py: New file.