DemoControl should support per-BoardReader fhicl configuration
As a part of the triggeredReceiver example, it was desired to have 3 ToySimulator instances with completely different configurations. DemoControl and manageSystem were modified to allow a FHiCL document name to be passed as a parameter for the Fragment Generators. If it is not passed, the default file (i.e. ToySimulator.fcl) is used instead.