Changing the depth/land layer in the ecospace map will affect existing Run Ecospace results

[jeroens]

To reproduce:

• Run Ecospace and view the small multiples map
• Now open the base map and change the layout of the land

You will see that the new land layout is reflected in the Ecospace results maps. This is not good; the results pertain an earlier run of Ecospace and the result maps should not change

Two possible solutions:

1. The Ecospace time step results should pass out a copy of the land layer which should be used to render the Ecospace results maps
2. The Ecospace results maps should be cleared as soon as any change is made to Ecospace (or Ecosim or Ecopath for that matter)

The latter solution must be implemented for result integrity reasons; any output should be invalidated once the underlying inputs are changed. However, solution 1 would not be bad to implement to make this app more solid.