Cannot load graphs 0.1

Originally reported by: **Attila Egri-Nagy (Bitbucket: [egri-nagy](http://bitbucket.org/egri-nagy), GitHub: [egri-nagy](http://github.com/egri-nagy))**

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Do you have `DotDigraph` somewhere else?

```
#!python

gap> LoadPackage("graphs");
Error, variable `DotDigraph' is not bound to an operation called from
...
```

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- Bitbucket: https://bitbucket.org/james-d-mitchell/digraphs/issue/4
