message: Link from Quest Doxygen top level to Sphinx top level.
diff: @@ -12,3 +12,6 @@ Quest: Query points in meshes {#questtop}
  of a high-order mesh
  - A [function](@ref all_nearest_neighbors()) to find the nearest neighbor for each
  of a set of points
  +
  +The [Quest user guide](../../../sphinx/quest_docs/html/index.html)
  +also discusses these concepts.
  