Greg Lehey 71cfc6780e Update man pages and clarify a number of options.
Rework block count calculations to work correctly with small "block" sizes.

MFC after:	14 days
2012-11-16 03:33:34 +00:00
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2012-11-02 22:32:47 +00:00
2012-09-18 13:24:14 +00:00
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