Generates a graph (using graphviz's dot) of doit tasks.
Sample for doit tutorial tasks:
pip install doit-graph
$ doit graph
$ dot -Tpng tasks.dot -o tasks.png
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By default sub-tasks are hidden. Use option --show-subtasksto display them.
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By default all tasks are included in graph. It is possible to specify which tasks should be included in the graph (note dependencies will be automatically included). 
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To draw tasks in execution order (i.e. reverse of dependency direction), use option --reverse
$ doit graph --reverse
- To draw tasks from left-to-right instead of the default top-to-bottom, use option --horizontalor-h
$ doit graph --horizontal
- group-tasks have double bondary border in the node
- task-deparrow have a solid head
- setup-taskarrow have an empty head
calc_dep and delayed-tasks are not supported.

