PredictiveEcology/SpaDES.tools: v0.3.1

Known issues: https://github.com/PredictiveEcology/SpaDES.tools/issues version 0.3.1 Dependency changes RandomFields moved to Suggests to prevent clashes with data.table multithreading Enhancements randomPolygon now has area argument, instead of hectares (deprecated), and it now succeeds for more cases. mergeRaster now accepts a function passed by the user when mosaic is triggered (#55, @tati-micheletti) initiateAgents example fixed to work with newer raster package versions (@rhijmans