deltaV and acceleration data in Ship Info screen

deltaV and three accelerations (main, retro, up, in m/s^2 and G) display for the Ship Info screen.
All are the current value, based on current fuel and mass (intended at least, please check the calculations).
Just to follow up #2211

![screenshot-20131030-091913](https://f.cloud.github.com/assets/4182678/1435353/044b7858-413c-11e3-87d1-5df771425583.png)