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Some changes:
- The core crate is renamed to "chain".
- The crate "viz" is added, which will provide layered graph drawing
algorithms.
- A function is added to convert from a grammar to the regular
language of its left-linear closures.
- A function is added to convert from a nondeterministic finite
automaton to its "null" closure. A null closure is the same
automaton with edges added, as if some edges are "null". Whether an
edge is null is determined by a function.
Combined with the previous change, we can convert a grammar to the
regular language of the null closure of its left-linear closures.
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Now it remains to test more grammars and add an Atom trait, before
finishing the part about compilations.
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