I'm certain that I'm missing something obvious - I cannot figure out how to colonize the Moon. I've created a colony, dumped infrastructure and some auto mines on it, but although my colony ships have the option to pick up colonists from Earth, there's no matching command to drop off the colonists when I select the colony fleet with my Luna colony.
I've even tried setting standing orders for the colony ships to "Unload Colonists" and "Unload Passengers" with no effect.
Edit: They were missing Cargo Shuttle Bays, for anyone who comes to this topic later.