Usage: redo-dot target [...]

Write dependency DOT graph to stdout.
=> https://en.wikipedia.org/wiki/DOT_(graph_description_language) DOT
For example to visualize your dependencies with GraphViz:

    $ redo target [...] # to assure that **/.redo/*.dep are filled up
    $ redo-dot target [...] >whatever.dot
    $ dot -Tpng whatever.dot >whatever.png # possibly add -Gsplines=ortho
