0 if not at all contiguous, 1 if contiguity was at least a 1
1 if side1 is European and side2 is not European
1 if both sides are European
same as EuropeDummy, but excludes the US and commonwealth states from the list o
revised version of EuropeDummy to see if coding Turkey as European matters
1 if neither state is european
1 if side1 is not European and side2 is European
1 if only side1 is western european
1 if only side2 is western european
1 if neither belligerent is western european'