Sean Morrison c4be1ca649 Implement ft_col_count() along with corresponding unit tests
This pairs with the existing ft_row_count() using the same column
counting method used elsewhere in the code (i.e., iterate over rows
and find the biggest).

Added unit tests for ft_row_count(), ft_col_count(), ft_is_empty(),
and use a myriad of insertion methods to increase coverage.
2020-11-29 12:38:31 -05:00
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