ComputeWordProbs: Sort all numeric values from highest to lowest
ComputeWordProbs: Fix bugs in information gain calculation
ComputeWordProps: Make entropy/inf-gain calculations parallel
ComputeWordProps: Add assertions to try and catch bug
ComputeWordProps: Make preliminary calculations non-parallel (but doesn't fix bug)
ComputeWordProps: More assertions to try to catch bug
MultiRegularCell: Attempt to fix bug in hierarchical classification caused by floating-point rounding error, where get_subdivided_cells() returns no cells
ConvertWorldTweets: New utility app for converting Bo Han's World Twitter corpus
GridRanker (hierarchical): Eliminate one unneeded pass reading docs