* New: In CRL::RoutingLayerGauge, two new types of gauge are supported:
- Unusable : just do nothing with it, but the layer is stacked.
- BottomPowersupply : can be used for supply routing only, and
is *below* the normal routing layers (instead of on top as
usual).
Both new types must be *below* the real routing layers.
* New: In CRL::RoutingGauge, add a new attribute "firstRoutingLayer"
to give the index (depth) of the first layer usable for routing.
(not Unusable and not BottomPowerSupply)
* New: In Anabatic::Session & Anabatic::NetBuilder, in order to build
the initial wiring, provides (Session) and use (NetBuilder) the
new functions:
- getBuildRoutingLayer(depth)
- getBuildContactLayer(depth)
Thoses functions takes into account (offset) the unusable layers
so depth 0 is the first usable routing layer, and so on.
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