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Fixed graphviz/dot graph & improved clarity (#642)

I fixed graphviz missing output to web responses (see image of https://github.com/oauthlib/oauthlib/pull/639), and I have added a fixed rank (`rank=same`) when functions are achieving an identical goal. E.g. `validate_client_id`, `validate_user`, `validate_bearer_token` are unique for each flows, or, e.g. `confirm_redirect_uri`, `validate_redirect_uri` together, and so on.

![graphviz-0cc58e863](https://user-images.githubusercontent.com/820496/50830407-042ad600-1348-11e9-936a-03d07f42494f.png)

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