jump shuttles

Back when the jump shuttle idea was born, the jump grid was in the DRIVE, not
the HULL. Thus, there was no problem with using jump shuttles with non-jump
vehicles. It probably wouldn't cost much, or weigh much, to put jump grids into
non-jump ships (say, Cr1000 and 0.01 ton per max jump number times the ship's
tonnage [adjust jargon for MT]).