Server - HDI and GDP fixes, plus a few other fixes.

- Have the game load up "correct" 2000 HDI and GDP values. TODO: Update
GDP for specific regions where known and available, such as for Hong
Kong and Montenegro.
- Update the human development calculation to take GDP per capita (using
it as the GNI per capita) into account.
- Change the GDP per capita "factor" to be the same as the HDI GDP/GNI
component.
- Minor fix to the limit-exports-to-production functionality; was
getting infinite loops in the method for some reason. Not sure if it
really fixed it, but I haven't encountered it since the fix...