contrib/bst-graph: Add script to print graph in DOT format

Chandan Singhrequested to merge
chandan/dot-graph into master

This script leverages the recently added format strings (%{build-deps}, %{runtime-deps}) to bst show to print a graph in DOT format. This requires users to have the graphviz python package installed.

Additionally, users can also render the graph using the --format option if they have the graphviz command line tool installed.

Fixes #705

Edited by Javier Jardón

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