* generic/tclIO.c (Tcl_CloseEx,CloseWrite,CloseChannelPart,ChanCloseHalf):

	Rewrite the half-close to properly flush the channel, like is done
	for a full close, going through FlushChannel, and using the flag
	BG_FLUSH_SCHEDULED (async flush during close). New functions
	CloseWrite, CloseChannelPart, new flag CHANNEL_CLOSEDWRITE.

	* tests/chanio.test (chanio-28.[67]): Reactivated these
	tests. Replaced tclsh -> [interpreter] to get correct executable
	for the pipe process, and added after cancel to kill the fail
	timers when we are done. Removed the explicits calls to [flush],
	now that [close] handles this correctly.

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