Minor Release 0.3.0
Added functionality:
- Added stream operators so that a BModel can be streamed to and from files etc.
- Simplified calculations in BSpatialTransform for full 6x6 matrix representation and added arb::dual matrix.
- Added new member functions to BSpatialVector (constructors), BMatrix63 (accessors), and BABInertia (arithmetic).
- Some formatting and general improvements to comments.