Add analyzeRotation for python API

[stingjp]

In Python we have the option to perform output analyses using the 'analyze' and 'analyzeVec3' functions. This works for most outputs, but if we wanted to get the orientation or rotations for a given frame using these tools, we are unable to, since the output is of type 'Rotation'. It could be nice to add an additional method for python that would allow users to directly handle these types of outputs from their simulations.