Interface improvement suggestions for patch

[apache]

I would like if the planets window did not display any planets that there is no known path to. For example, if you shut off yourself by closing warp points, yet know about several systems outside your holdings, those planets should not show up in the planets screen because you cannot get to them. Perhaps this should be an option, though I cant ever think of any situation where you would need to see the planets you can't travel to. It would make colonizing a lot easier when you close yourself off from the rest of the galaxy.