First 2 extensions

1)     Coordinate validation

The method simulation.InputCoordinate  sould house all the required validation checks for the  coordinate inputs (range check, type check, presence check)

2)     Custom Settings Values Validation

This set of inputs should be validated

1. Landscape size (range (3->30), type check , presence check)
2. Number of Warrens (range 1-> < #locations, type, presence)
3.  Number of foxes (range 1-> < #locations, type, presence)
4. Variability (range 1->100, type, presence)