More on the theme of storage tracking

- Tracking armor added to stores when leaving soldier info screen
- Stop positive and negative zeroes:
![screen064](https://cloud.githubusercontent.com/assets/1824834/2874316/8d591334-d3e1-11e3-80b4-96580c5a0d03.png)
![screen065](https://cloud.githubusercontent.com/assets/1824834/2874318/93575a66-d3e1-11e3-8471-976c0cbd9e3c.png)