* Implements a simple version of stall-on-demand for CH queries.

* Makes stall on demand the default for CH. Moves different CH routing algorithms to routing package.

* Renames CH algorithms.

* Adds measurements for CH without stall on demand.

* minor cleanup

* Adds tests revealing bug in stall on demand implementation.

Stall on demand can prevent finding a shortest path if the weight of an
edge depends on the driving direction as with Motorcycle or Bike2 weightings.

* Fixes bug in stall on demand implementation.

When checking the stall on demand condition so far the wrong edge
direction was used to calculate the weight of the incoming edge.

* Adjusts prevOrNextEdge parameter in stall on demand check.

* Adds author tag and removes stall on demand public constant.

* Adds author tag and removes stall on demand public constant.

* Fixes compile error.