Sense of '*_old' traineddata files

[Luca Balsanelli]

Hi.

  Currently there are three '*_old' traineddata files in tessdata_best and tessdata_fast (ita_old.traineddata, kat_old.traineddata, spa_old.traineddata).

It's probably a naive question. Nonetheless, does the '_old' suffix refer to the fact that the file is better to recognize ancient languages (like Dante's Italian) w.r.t. the one without the '_old' suffix, or do they refer to a previous version of the file that for some reason has been kept with an '_old' suffix?

Thanks,

Luca