flammkuchen 0.1.1

Some data structures for fun and flammkuchen (e.g. a 2d grid which permits negative indices)
Documentation
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_Some data structures for fun and flammkuchen._

Find more at [docs.rs/flammkuchen](https://docs.rs/flammkuchen).

P.S. pictures of your homemade flammkuchen may optionally be added to PR's.