Make capturing ships much much more lucrative than sinking them

[psykikk 66]

In the old times, most of the ships werent actually sunk. but either plundered and sent ontheir way (to hopefully plunder them again in the future) or seized to make pirate ships out of them or outright sell them(often to nations that wanted to bolster their tradefleets and navy)

so: instead of sinking ships, make it viable and lucrative to capture and seize ships.

you can do that with AI ship traders who offer hefty sums for boarded ships. 
implement a drydock where boarded ships can be "docked into" . graphics change and it shows the apropiate ship type being in there and refitted.

afterwards it disappears.  

during the time its refitted, any player can also buy the ship (if allowed)