n-e: Fix an hyperdrive crash due to self: forgotten
n-e: Make the compat table public

We can afford the namespace pollution since it is only a temporary
measure.
n-e: Silence some warnings in Tradeships.lua
n-e: Add a necessary 2 seconds delay to avoid takeoff time conflict in TradeShip.lua
n-e: Update the slots to match the new ship data
n-e: Use kg as mass unit for the equipment.