Added option to set the dpi of the output #379
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This adds the option 'output_dpi' for the user. This is used to set the 'dpi' of the output, the default is 96 which is also the default GraphViz default. https://graphviz.org/docs/attrs/dpi/
This comes from my annoyance that the text is kind of pixelated with 96dpi and having the option for higher res pictures is nice