removed trailing blanks
improved dialog description (could also be a tooltip)
revised SimulationX simulator plugin
 * threaded COM access (by marshalled interface objects)
 * support of simulationStopRequest
 * improved error and exception handling
 * support of vector parameters and variables, if dimension is fixed
 * support of SimulationX models (*.ism) and SimulationX project (*.isx) files
 * added option to use SimulationX 3.6 (default), SimulationX 3.5 or SimulationX 3.7 (in future)