Fixed a defect in iosrv.exe that caused a panic if a foreground read object was attached to a different end point. This was due to the read object being notified of a change in foreground before its iEndPoint member was updated. This member is now updated before attempting the attach, and is set to NULL in the event of a leave (resulting in the read object being left in an unattached state). Also tweaked ymodem.cif to make it more readable.

EXPORTS
	Close__12RExtraBtrace @ 1 NONAME R3UNUSED ; RExtraBtrace::Close(void)
	Connect__12RExtraBtrace @ 2 NONAME R3UNUSED ; RExtraBtrace::Connect(void)
	EnableProfiling__12RExtraBtracei @ 3 NONAME R3UNUSED ; RExtraBtrace::EnableProfiling(int)
	Handle__C12RExtraBtrace @ 4 NONAME R3UNUSED ; RExtraBtrace::Handle(void) const
	__12RExtraBtrace @ 5 NONAME R3UNUSED ; RExtraBtrace::RExtraBtrace(void)