Added PRotected areas class to the Sprawl model.
New Polygons layer.
Fixed bug with perish method in Environment template.
Removed unecessary tasks folder.
Code cleaning in Simulation template.
Generating Environment objects in Sim tamplate only if there is no input
layer.
Fixed bug initialising Environment geometries in the Factory.
New Lines Layer.
Corrected init values for Environment classes in Sprawl model.
Beautified PredatorPrey model.
More beautification to the PredatorPrey model.
Beautified Life model.
Environment classes now using GeomPortrayal for portrayal.