More ground-level biomes

[technicalfool]

The idea being that you can do scientific experiments and gain maybe 1 science unit (or some low amount) for every few metres of ground surface the experiment is performed on, above the amount available from the normal ground-level biome that you're walking or roving over. Amount of science left in the biomes could be mostly stored on disk rather than filling RAM with planets worth of biome info, the problem being how to wrap a big 2D grid around a sphere without making it so there's lots more science at the poles. Though, given the extra difficulty required when transferring to/from polar orbits, that could be desirable.