overlay properties static

[max]

In the current planetsim every node has its own overlayproperties object, but the properties should be in every node the same, so I suggest to make all methods in the overlay properties static to increase performance

[jordi]

Currently the overlay properties is accessed by means of a static attribute in the planet.util.Properties. Thus, only an instance is maintained while the simulation runs.

The reason to appear and be accessed in this way is because one can exchange the overlay properties implementation and configuration values, respectively, without recompiling PlanetSim. It is flexible and the unique cost is to access to its own overlay properties thrhoug the static attribute aforementioned.

Do you think it is yet necessary this 'conversion'?

Jordi