Clean up whitespace, order, formatting, documentation
Ensure that index col is not inferred when reading data table
Do not subset metadata for categorical columns
SAR should return areas as x not fractional areas
Improve formatting of pair column in comm_grid
More informative error for missing column in cols
Better method for locating centers of cells based on start and end
Improve formatting of levels in subset strings
Remove old distance functions
Complete unit tests for existing empirical functions