Add tolerance checks for tests in space-age

[mikecoop]

The tests numbers are rounded off but don't have any tolerance checking.
They fail if the number isn't exactly the same.

[kytrinyx]

It seems like the tests are explicitly stating that the result should be rounded. I'm not sure that this is correct, but I think that it's worth discussing.

One thing that I think would be important to avoid, is cumulative rounding errors (if Earth gets rounded, and all others are based off of Earth, would the tests pass or fail?)

[mikecoop]

It's not a problem if the results should be rounded to two decimal places but I think it should explicitly say that in the problem. It took me a while to figure out what I was doing wrong when I was solving the problem even though my numbers were correct.

[kytrinyx]

Hm. Yeah, that's a good point. I don't even know if it's explicit or that all the languages do it in the same way. I think that as long as the tolerance is small enough that we wouldn't allow accumulated rounding errors this is fine. Merging.