fixed the issue #13 "Turning off a column disables the total at the bottom" and added GUI improvements

Fixed the issue #13 "Turning off a column disables the total at the bottom" and fixes version number

Added some GUI Improvements:
- Values of Mass and Cost grouped together
- grouped areas can be highlighted
- words "Full" and "Empty" changed to "Wet" and "Dry" in Mass headers

![2014-11-14 00-06-20 kerbal space program](https://cloud.githubusercontent.com/assets/6450733/5036996/3d941f00-6b95-11e4-8cc6-d0e61e6b6c89.png)

- numbers in "Res." and "Dry/Empty" columns can be colored

![2014-11-14 00-17-49 kerbal space program](https://cloud.githubusercontent.com/assets/6450733/5037011/51ddd370-6b95-11e4-853f-459550d84a26.png)

![2014-11-14 00-18-30 kerbal space program](https://cloud.githubusercontent.com/assets/6450733/5037013/55c8ddb8-6b95-11e4-99f1-e4f00d630230.png)

![2014-11-14 00-19-08 kerbal space program](https://cloud.githubusercontent.com/assets/6450733/5037014/580e9752-6b95-11e4-990b-36b557b7b8af.png)


My personal coding standard is to always use {}'s, even for single line if statements. It makes the intent clearer and avoids a common type of error.