[minor] Cosmetic + chmod +x on test scripts
Added tools to generate the letter datasets from the ujipenchars2 dataset

Mostly based on Deanna process.

Generates datasets for all symbols in the UJI pen char dataset,
but ignores multi-stroke samples for now.

The kMeans clustering is not yet done, which leads to weird models
when several allographs are present.
Add the datasets for all the symbols present in the UJI pen char 2 dataset