Version 0.2: 20.12.02

New structure of demo.csv:

int: age
float: number of females
float: number of males
float: deathrate of females
float: deathrate of males
float: weight females immigration
float: weight males immigration
float: weight females emigration
float: weight males emigration

The new columns of weight are introduced to adapt the modell to the
specific of the area.

Remove of some little bugs. 

Version 0.1: 3.9.2002

The first version
