Don't block when data might be available in the buffer.

(__all__): New constant.
(RAW): New constant.
(CBREAK): New constant.
(COOKED): New constant.
(user): New class.
(user.__init__): New method.
(user.send): New method.
(user.close): New method.

	previous run through the loop.  It may have left parseable
	data in a buffer.

callback functions) to exit the loop.

(CONT): Removed.
(BREAK): Added.
(controller.__init__): Remove the __done attribute.
(controller.loop): The default is now to continue.  Break only if
	the user explicitly breaks out of the loop.  All references to
	__done removed.
(controller.re): Remove __done accesses.
(controller.eof): Ditto.
(controller.timeout): Ditto.
(controller.cont): Method removed.
(controller.__run_expectations): Default is to continue, unless
	the callback returns BREAK.
(expect_after): A callback should return None or BREAK; not CONT.
(expect): A missing callback is treated as a callback that returns
	BREAK.

package layout.

(__all__): New constant.
(controller): New name for former class impl.

(__all__): New constant.

(impl.re): Ditto.

	expect module.  I don't really like it, but if you don't want
	to use a pre-processor I guess you cannot do anything much
	better than this.

(telnet.close): New method.
(telnet.fileno): New method removed.
(impl.re): Use repr to format the strings in the debug statement.

fill_buffer.
(expectable.fill_buffer): Extract the reading to the _read method,
	so that it can be overridden.
(telnet): New class.
(telnet.__init__): New method.
(telnet._read): New method.
(telnet.send): New method.
(telnet.fileno): New method.

since they are sometimes very slow.

program.

(EOF): New constant.
(TIMEOUT): New constant.
(CONT): New constant.
(BadArgs): New exception.
(_expect_before): New variable.
(_expect_after): New variable.
(expectable.fill_buffer): Treat EIO as end-of-file.  You apparently
	get this from a pty when the child exits, at least on Linux.
(spawn.send): Log what is sent via debug.
(impl.loop): Implement expect_before and expect_after.
(_expect_before): Removed.
(_expect_after): Removed.
(impl.__expect_before): New method.
(impl.__expect_after): New method.
(impl.__run_expectations): New method.
(expect_after): New function.
(expect_before): New function.
(__validate_expectations): New function.

simultaneously.

mandatory ftp demo.  Every expect module needs one.

for now it is written manually.

(stty_init): New variable.
(set_cloexec_flag): New function.
(spawn): New class.
(spawn.__init__): New method.
(spawn.send): New method.
(spawn.close): New method.

classes seems to work now.