Aggregate smaller countries by region

src/ac/ed/lurg/ModelConfig.java

src/ac/ed/lurg/ModelMain.java

src/ac/ed/lurg/country/CompositeCountry.java

src/ac/ed/lurg/country/CompositeCountryManager.java

src/ac/ed/lurg/country/CountryAgent.java

src/ac/ed/lurg/country/CountryBoundaryItem.java

src/ac/ed/lurg/country/CountryBoundaryRaster.java

src/ac/ed/lurg/country/CountryBoundaryReader.java

src/ac/ed/lurg/country/CountryManager.java

src/ac/ed/lurg/country/SingleCountry.java

src/ac/ed/lurg/country/gams/GamsCountryInput.java

src/ac/ed/lurg/country/gams/GamsLocationTest.java

src/ac/ed/lurg/country/gams/GamsRasterOptimiser.java

src/ac/ed/lurg/country/gams/GamsRasterTest.java

src/ac/ed/lurg/demand/BaseConsumpManager.java

src/ac/ed/lurg/demand/BioenergyDemand.java

src/ac/ed/lurg/demand/DemandManager.java

src/ac/ed/lurg/demand/SspKey.java

src/ac/ed/lurg/demand/SspManager.java

src/ac/ed/lurg/landuse/CropUsageReader.java