1. (UNIX) Fix problem introduced in edit 706 with file count being used up and spurious queue zapped problems.
2. Clean up a display problem in VUE when using REPLACE past right margin.
3. Under NT, allow open of random file on a read-only device. Previously this generated an access denied error. Now you won't get any error until you try to write.
4. Display Windows errors in more situations when TRACE=SYSERR.
