CleverRaven/Cataclysm-DDA — pull request #3504 by ianestrachan (2013-10-07 17:32:13+00:00)
Title: Fix the 'enough wheels' calculation

Fixes #3501.

Also affects the motorcycle with a sidecart, and probably the cube van, and any other vehicle with a wheel that's not on the top of the z-order list.

Essentially, the game was still looking over the topmost parts rather than all parts to find the wheels, so it was missing any setup where another part covered the wheel.