- Bug: In Grid::Grid(), uses trans-hierarchical iterators to compute the
sum of "instance width" instead of the "flat" ones.
- Bug: In Grid::rectangularShape(), uses "minWith" parameter *only* if it's
different from DbU::Max.
- New: Now options are handleds by the standard "Configuration". Especially
suppress the need to specify a Library when creating the tool. Now the
Configuration directly supplies the CellGauge & RoutingGauge.