I tried to do some things in our structure of the project as we talked about it today/yesterday. So now we have something to talk about.

- Added empty template for the first CUnit test file
- grouped constants into the defined struct
- grouped land properties into typedef struct
- updated initialisation of the land in neighbours file
- added .h files (I think this idea of Stephan is actually good and was stupid from me to refuse it)
- just commented the inside of the population file (it was a bit late when I did this)