RoundedCube should be centered by default

[mikosik]

RoundedCube class has private field centered which gets false value during initialization as there's no explicit initialization of that field. The whole functionality that is controlled by that flag field looks to me like copy pasted from Cube class with the only difference that in Cube class it is explicitly initialized with true value. This copy-paste mistake makes it impossible to control centered field in RoundedCube as the only method the changes its value (noCenter()) changes it to false so there's no possibility to change it to true.

[madhephaestus]

This issue is resolved in the branch: https://github.com/NeuronRobotics/JCSG

[miho]

Thanks for the fix. I'll add the fix to the master branch.