Correct flatfile datafiltering logic.
Correct flatfile datafiltering logic.

Use of NaN may not be the best method, but it's more valid then 0 data, and
less intensive than generating linear interpolation.

glasnt/machiavelli,machiavellian/machiavelli,machiavellian/machiavelli,glasnt/machiavelli,machiavellian/machiavelli,machiavellian/machiavelli,glasnt/machiavelli,glasnt/machiavelli