updates LayoutOperations::prepareBlockSwappingFailedAlignment, consider an stepwise
increased bb to search for intersecting blocks to swap with in case vertical buses fail to
align; this way, situations where blocks have no immediate counterpart on the other layer
are handled; update dbg logging
fix LayoutOperations::performRandomLayoutOp, fix operation selection for failed alignment
minor update class FloorPlanner, reduced SA_REHEAT_STD_DEV_COST_LIMIT to 1.0e-03
fix LayoutOperations::prepareBlockSwappingFailedAlignment, for failed vertical buses,
    select blocks to swap with which are intersecting the _partner_ block, only this way
    the bus can be eventually fulfilled