Todd 988f2e3290 spreadsheet: move ColumnToIndex/IndexToColumn ...

Create a spreadsheet/reference package and put these functions
there. This prevents both duplication across the formula &
spreadsheet packages and a cyclic reference.

2017-10-01 19:29:13 -05:00

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spreadsheet: move ColumnToIndex/IndexToColumn

2017-10-01 19:29:13 -05:00