* contrib/hbtcpio/tcpio.c
* contrib/hbpipeio/pipeio.c
* modified hb_fileWrite() to return 0 in case of timeout or unblocking
write and -1 on other errors.
* contrib/hbcomio/comio.c
* modified hb_fileRead() to return 0 in case of timeout or unblocking
read and -1 on other errors.
* src/rtl/filesys.c
* return -1 instead of 0 from hb_fsPipeWrite() in MS-Windows and OS2
builds if PIPE state cannot be read
* ChangeLog.txt
! c&p typo in previous ChangeLog entry
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