added chaining capabilities to analysis.toolbox.Plotter.java
hard-coded constraint that a vehicle having an initial route cannot be
switched
modified core.problem.VehicleRoutingProblem.Builder to deal with jobs
being part of initial routes

i.e. these jobs do not appear in jobMap of problem since they are not
variable anymore
adjusted
test...core.algorithm.recreate.CalcVehicleTypeDependentServiceInsertionTest
to changes in class to be tested
added .newInstance(..) factory-method in
core.problem.solution.route.VehicleRoute.Builder to construct a builder
without defining Driver
added unit-test testing core.problem.VehicleRoutingProblem
adjusted unit-test
added examples.MultipleDepotWithInitialRoutesExample to illustrate
initialRoutes
added input-file for example