Personalized PageRank NodeDB v0.3.0

Bias the PageRank teleport vector toward a seed node. Demonstrates the PERSONALIZATION {…} clause on GRAPH ALGO PAGERANK and the Hash-to-JSON encoding landed in nodedb-ruby 0.1.0.alpha.5.
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Pick a seed node to personalize the ranking.

The standard PageRank view (Graph + PageRank) uses the uniform teleport distribution. This view biases the teleport probability mass onto the seed so its neighborhood floats to the top.