Changes to take productions from Crafty

src/ac/ed/lurg/ModelConfig.java

src/ac/ed/lurg/ModelMain.java

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

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

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

src/ac/ed/lurg/country/crafty/CraftyCountryAgent.java

src/ac/ed/lurg/country/crafty/CraftyProdManager.java

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