update ThermalAnalyzer::adaptPowerMaps, dropped consideration of spread-out TSVs; added
consideration of dummy thermal TSVs in uppermost die
updates classes FloorPlanner and ThermalAnalyzer; added flag for signal-TSV clustering,
	related updates
fix Net::setLayerBoundaries, consider also terminal pins for determination of lower
boundary
added initial FloorPlanner::clusterSignalTSVs, related updates of
FloorPlanner::evaluateInterconnects