Allow fixed star to be "rotating", i.e. velocity is given by Metric::circularVelocity()
MPI: move all the raytrace logic into Scenery::rayTrace
Factory: allow constructing an object from in-memory XML data.
Merge branch 'master' into mpi
MPI: use a buffer instead of a temporary file when cloning remotely
MPI: works as long as gyoto-mpi-worker is in the PATH, which is the case by default.
MPI: support all the quantities except impactcoords
MPI: support using provided impactcoords