A bunch of small changes

Vending machines can now be anchored/unanchored using a wrench.

Adds the possibility of randomizing airlock wires for mapping and/or future use.

Makes it harder to accidentally undress yourself if you thought you had webbing on but didn't.

Removes the awful looking double wall from the maintenance tunnel
between medical and engineering.
![screenshot 2014-05-28 12 34 45](https://cloud.githubusercontent.com/assets/242428/3137656/9a23697a-e859-11e3-831e-51b5edfd974d.png)