Update "cln" CLONE description

FROM: (Which is not to clear)

cln: "cln" Clone. A ship code. This tells the starbase that you own and are in orbit with to make an exact copy of the ship with this code. The starbases' tech levels must be equal to or greater than the ship being cloned. (Shareware and Registered players)

TO: (This description has alot of usful information for new players)

cln: "cln" Clone. A ship code. This tells the starbase that you own and are in orbit with to make an exact copy of the ship with this code. The starbases' tech levels must be equal to or greater then the ship being cloned. This will in most cases cancel out the normal starship building on the starbase any turn that there is a starship with this code in orbit. The cost of cloning a ship (megacredits) is 200% of the original cost of building the ship. The Privateers and Crystal People can not clone. You can not clone ships that your race can already build. Ships that are being cloned must stay at the starbase. A ship that is being cloned will have its warp speed set to zero.