[m-rev.] for review: document `--use-grade-subdirs'

[Fergus Henderson]

It would also be a good idea to add a test case for --use-grade-subdirs,
if there isn't one already.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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