[barcode] Circular barcode

[Alessandro Rubini]

> Any barcode reader could be used for readback, as far as it is
> positioned or moved radially. Every bar becomes a circle, like this
> [...]

Ahh....

sorry, I misunderstood. I was thinking about turning the barcode around
to make a circle (I'm sure I've seen such strange thing once in my life,
but I never saw what you describe).

That's an interesting idea. Yes, I would do it with a postoprocessor
like you suggest.

/alessandro