implement Cancelio (updated), WriteFile update, comm16 update

Good day!

If you get this, these three patches fix a regression in 16 bit
serial comms as practiced by Juno 1.49 that was intrduced by:

Changes by:	julliard(a)wine2.	01/12/31 20:11:33

Modified files:
	files          : file.c 
	scheduler      : synchro.c 

Log message:
	Mike McCormack <mike_mccormack(a)start.com.au>R
	Set an overlapped's hEvent for ReadFile/WriteFile in an
overlapped
	completion function, not in ReadFileEx or WriteFileEx.

Patch: http://cvs.winehq.com/patch.py?id=1009847493736738936509937

So I'm in favor of committing them.

Regards,

Lawson