Land upgrades

The only major problem with land isn't how it affects costs, but rather how slowly you gain it. Here are some suggestions on how to fix it, though I suggest against doing them all since that would make land *way* too common.
 * Doubling the land investment alotment you get from systems.
 * Adding an intermediate land investment or two before dyson spheres.
 * Increasing the rate at which systems scale in land, and maybe slightly boost how quickly they scale in other ways as well.
 * Having land science affect systems, which I'm not sure if they currently do.
 * Having more land science available.
 * Reduce the vision cost scaling at +10 systems because even with alot of science and a million plus buildings, it will still take days for me to find the 15th system.