Re: naive implemnatation of KNN

[andrea]

@mora It should be certainly possible to analyze not just the first one, but 
rather, say, the first 100 fields and try to deduce the field types from a CSV 
example. If anyone is going to do this, I would really like to see it inside 
[https://github.com/unicredit/csvtools](https://github.com/unicredit/csvtools)