Scenarios with waypoints support, and scenario added

- Added support for XML scenarios with waypoints. They are now specified
by the <object_with_waypoints> tag, with any number of <waypoint> tags
as children. An example is in scenario4_active.xml in this commit. The
code to enable this is a new object for TrObjectWithWaypoints within
SimSettings as well as some XML parsing code
- Added a scenario with waypoint objects for each of the three AI nodes
- Took out the empty constructor for TrObjectSettings for safety
- A large number of formatting fixes and a couple of small enhancements
to WorldView
Updated experiment scripts (for histparams)

A few enhancements and minor changes to the scripts that run experiments
across the parameters for history-based bidding (to find the optimum)