Started work on finding formulas
Include formula in test
Introduce generalized formulas
WIP dealing with formulas
Further compress formulas
WIP on dependency graphs
WIP generating graphs
Added varnames
Added colors
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ADDED: cell_dependency_graph/5.
Basic stuff to show graphs using GraphViz
Various details
There is no variable to name
Mixup row/col
Trap single formulas
Create formulas that connect datasources
Get cell ranges for repeated single row/col formulas
Handle rectangular areas
Difference list version, preparing for handling carthesian product