fixed EU 15 country selection

Two things about the 15 countries:

1. there were only 4 countries in 2012, so I took them out in the correlation analysis. (I have not however redone the graphs)

2. Germany was not in the dataset until 1990. (it was actually 14 countries from 1970 and 15 from 1990). So instead I changed it to use both East and West for the whole and threw the joined Germany out (I checked that the data was actually the same E+W==NP after 1990, the test is in the code). So that meant also rerunning all the arrange_tidy_data stuff, so all the datasets are fixed. 

So that means you can rerun your part with the new datasets now in Data/Tidy:
- but take 2012 out of the analysis
- and it will now have germany correctly accounted for.
Not that it will change anything much I wouldn't think!