Added spatial example

[sulays]

• zones.tif is created from "Climate Zones with names.geojson" and "Wet Dry Climate Table.xlsx" with dry as 0 and wet as 1.

• land_use.tif is the land use raster file of Dominica.

• Added buildunitmodule to build land units for spatial example

• The spatial example works in the following way:

  1. The module checks whether the land unit is agricultural or not based on land_use.tif
  2. If the land unit is agricultural then synthetic and organic fertilizer events are created for that land unit every 3 months.

• Added FCR table to calculate activity data for emission from crop residues.

• Issue #7 is still not resolved and due to runtime of events the events need to be sorted which is not yet implemented.