Verity Chu

Refined `getVariables()` by removing some redundant code. Also created `checkNodeIndependenceAndConditioning()` helper function for readability.

[Draft]: Calculate local markov blanket against true graph for parted nodes that passed AD Test

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WIP! Need to check with Joe on how to find a node in estimated graph's corresponding node in the true graph. I tried using node's name, but it doesnt seem...