Argument --block-size=0 should be considered an error.

[eth-p]

Using --length=16block with --block-size=0 is the same thing as doing --length=0, and it doesn't make much sense to do intentionally.

Related: #106

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Note: I'm doing a class assignment regarding creating tests (from scratch) for an open-source command line program, and I chose hexyl for it. You might have a couple more of these on the way, depending on what the assignment brings to light :)

[sharkdp]

Thanks. We should disallow block sizes of 0.