adapted workload model

...ool16/CreateCallParameterSetting_value_RandomVariable.gif

...l16/CreateClosedWorkloadType_thinkTime_RandomVariable.gif

...reateDelayUserAction_timeSpecification_RandomVariable.gif

...reateLoopUserAction_loopIterationCount_RandomVariable.gif

...reateOpenWorkloadType_interArrivalTime_RandomVariable.gif

...m/workload/provider/CallParameterSettingItemProvider.java

.../mm/workload/provider/ClosedWorkloadTypeItemProvider.java

...tes/mm/workload/provider/DelayUserActionItemProvider.java

...rtes/mm/workload/provider/LoopUserActionItemProvider.java

...es/mm/workload/provider/OpenWorkloadTypeItemProvider.java

...pd/descartes/mm/workload/provider/WorkloadEditPlugin.java

edu.kit.ipd.descartes.mm.workload.editor/plugin.xml

...pd/descartes/mm/workload/presentation/WorkloadEditor.java

...cartes/mm/workload/presentation/WorkloadEditorPlugin.java