Planning: minor - renamed column header [ ^ Home ] -> [ ^ WP ] 

Planning:
- distance is inter-waypoint distance, not distance to home
- shrunk column width from 90 to 70 - matches Altitude column and fits revised column header texttext
![screenshot_2013-10-14-15-10-31](https://f.cloud.github.com/assets/4014433/1328582/b4bc2078-3504-11e3-86af-71313ac157ba.png)