"sort -o -", "shred -", "tee -" POSIX-conformance fixes.

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+2004-08-10  Paul Eggert  <eggert@cs.ucla.edu>
+
+       * NEWS: Document "sort -o -" and "tee -" POSIX-conformance fixes.
+       * src/shred.c (usage): "-" is an operand, not an option.
+       * src/sort.c (die, xfopen, mergefps, first_same_file, merge):
+       A null file arg means standard output.
+       (main): "-o -" means to write to a file named "-",
+       not to standard output.
+       * src/tee.c (usage): "tee -" writes to standard output, not
+       to a file named "-".
+
 2004-08-10  Dmitry V. Levin  <ldv@altlinux.org>
 
        * src/install.c (change_timestamps): Fix int->bool conversion