Added recent debugging fixes - dec. tree in logreg, unique index in...

Added recent debugging fixes - dec. tree in logreg, unique index in dataloader, new experiment setups

data/download-data.sh

+#!/bin/bash
+
+for part in datasets queries labels pivots ground-truths
+do
+    wget https://disa.fi.muni.cz/wp-content/bulky-data/lmi/$part.tar.gz && tar xvfz $part.tar.gz && rm $part.tar.gz
+done
\ No newline at end of file