Backport installer to python3 (Trisquel 8)

setup_trisquel8.sh

#!/bin/sh -e
# "-e" exists on first error.
#Check if user is root
if ! [ $(id -u) = 0 ]; then
   echo "You need to be root or have sudo privileges!"
   exit 1
fi

apt -yq2 install libpng-dev \
                libfreetype6 \
				libfreetype6-dev \
				python3-dev \
				python3-simplejson \
				python3-pyqt4 \
				python3-numpy \
				python3-scipy \
				python3-matplotlib \
				libgeos-dev \
				python3-shapely \
				python3-pip \
				libspatialindex-dev
easy_install -U distribute
pip3 install --upgrade pip
pip3 install --upgrade matplotlib Shapely
pip3 install rtree
pip3 install svg.path
pip3 install request