data/ml/forest-to-pdf.py: Create a collection of PDFs instead of single huge one
data/ml/forest-to-pdf.py: Create a collection of PDFs instead of single huge one

I found no PDF viewer which would show it properly.

vineetk1/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa,Martinfx/yodaqa,Martinfx/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa,vineetk1/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa