brought new data.
Minor corrections of Carole_Bonnet2.py
Implementing the net_gov_spendings
A collection of upgrades and fixes

Fixed bugs with the unit-tests structure. Everything is working as
intended.
Fixed the population input for C_Bonnet2.py. Now including population
from 1996 instead of 2007.
Merge pull request #28 from jsantoul/master

Beginning to add comparison function