Saiyang Gou 86f3f1096b Add NodeOrLeaf.dump() and NodeOrLeaf.search_ancestor() (#187) ...

- Add `NodeOrLeaf.dump()` to generate a readable and "round-trippable" dump for a parser tree
- `parso.tree.search_ancestor()` is deprecated, use `NodeOrLeaf.search_ancestor()` instead
- Set up children's parent in `BaseNode.__init__()`
- Add test for `search_ancestor`
- Various small type annotations improvements

2021-05-29 12:40:07 -07:00

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