Coordinate systems and transformations
In line with #287, add the capability to choose coordinate transforms (c1, c2) on a pair of objects (O1, O2) and transform one object into the other coordinate system (say O1 into O2, such that c1's point is translated to c2 and c1's axes are translated to be parallel to c2's axes).
Once this is done, the operation can be extended to allow other objects (O3, O4, …) to have the same transform applied.
Edited by David Thompson