Try to implement a label next to a ship. ship2.png does not display anymore.
A label is diplayed next to each ship.

The label shows if the ship can still move and or attack.
During developement, found a problem on certain graphic cards which can be
solved by enlarging the ship image size above 128x128.
Problem explained here:
https://code.google.com/p/pyglet/issues/detail?id=575