SaVi satellite constellation Visualization

I've released SaVi 1.4.2, fixing a couple of minor bugs in SaVi 1.4.1.

1.4.2 has a new feature that lets you view the source to the simulation scripts that create the satellite systems. I don't know if showing the internal workings will encourage people to go from playing with SaVi to doing more serious simulation work, but one can always hope.

And it's gratifying to know that, in these uncertain times, people are still buying ++ungood; T-shirts. It's a view that sums up the economy.