Add an intrinsic triangulations routine which maps points AND tangent spaces

[nmwsharp]

We need a function like equivalentPointOnIntrinsic(), which additionally gives the change-of-basis to align tangent spaces between the points. This information is essentially already there in tracing/layout/resolveNewVertex(), but we don't expose it in any routine. This would be useful e.g. to align tangent spaces of log maps computed on an intrinsic triangulation at a non-vertex point.