Current position should appear on map when in an unmapped room, but not after a teleport

[stephen]

Suggested by Moo. The idea is that your knight only makes a map of the current room when nobody else is around. But if he walks into another room, he still knows roughly where he is, even if he hasn't made a map yet (i.e. the dot should still appear on the map, but the room itself shouldn't be mapped). When you teleport, your knight gets disoriented so he doesn't know where he is at all (i.e. even the dot shouldn't appear). So yes, let's do it that way.