GitLab

* adapted tests as wgrid is pure virtual now

[ADD] some missed documentation of WBresenham_test.h

[CHANGE] WLine and WFiber are now of type osg::MixinVector< wmath::WPosition > and you may use them like full std::vectors.
[ADD] some unit tests

[CHANGE] - setting a default bounding sphere for all root nodes ensures that the intial camera always shows the complete data box (in our case this 255x255x255 box). This is implemented dirty since we do not have a class managing our reference coordinate system! Hopefuly this solves the problem of needing to press space to see the scene completely.