Cargo gauge and list, economy/trade window.

- scroller for cargo list
- translateable "fuel"
- cargo gauge under cargo list
- cargo gauge updateable after /Jettison/
- proper calculation for useed/free in cargo gauge
- alignment for columns and columns names

based on old proposal:
https://github.com/robn/pioneer/commit/e8e3f7eac487f5e31ef881d77b2d2d1f18865aab#commitcomment-3282550

![screenshot-20130710-183013](https://f.cloud.github.com/assets/1929111/776253/4f9537f2-e982-11e2-8f2d-7688a03836d6.png)