Graph
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 Clean up and get the rule forest generation working properlyWed, 07 Dec 2016 17:52:35 -0500, by Steve Losh
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 Lots of cleanup, docstrings, commentsThu, 24 Nov 2016 16:08:20 +0000, by Steve Losh
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 Clean up some package layout issuesWed, 23 Nov 2016 11:08:33 +0000, by Steve Losh
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 Plumb together all the rule tree/stratification stuffMon, 21 Nov 2016 16:52:13 +0000, by Steve Losh
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 Move all the graphviz code into its own fileMon, 21 Nov 2016 15:33:17 +0000, by Steve Losh
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 Stratify rules according to negationsSun, 20 Nov 2016 15:33:06 +0000, by Steve Losh
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 Start the individual rule treesFri, 18 Nov 2016 16:59:02 +0000, by Steve Losh