DefaultCategoryDataset.setValue() is extremely slow for wide datasets

[sebkajeka]

Where columns grow excessively wide, DefaultKeyedValues2D.setValue() (DefaultCategoryDataset.addValue simple refers to setValue) repeatedly calls List.IndexOf to resolve column indexes, this subsequently crawls to a halt when adding large numbers of columns (32,000 in this case).

Transposing the data however, and performing the same number of addValues does not cause a slowdown for 32,000 rows.

[sebkajeka]

#31