* New: In BasicLayer::Material, added "info" kind of material for layers
that are only informationals (i.e. not real GDS one). Created to
store geometric combination of layers, this is a temporary solution.
Have to define a clearer semantic for that.
* New: In CRL/helpers/AnalogTechno.py, new "Count" type for count numbers
that must not go through DbU::Unit converter. They are plain integers,
but stored in DbU::Unit (keeping track of that semantic is left to
the user).
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