Minor fixes to Make files
Make ubuntu_install.sh script set up Python3 on Ubuntu 14.04

Extend the ubuntu_install.sh script such that, if run on Ubuntu
14.04, it installs all dependencies for running FNSS also on
Python 3, while on versions 12.xx and 12.xx set things up only
for Python 2.7
Add test code to C++ distribution package
Change version number to 0.5.0