fix bug in the GDML trdHandler, where dimensions must be divided by 2
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@@ -24,6 +24,6 @@ void trdHandler::ElementHandle()
Geant4 and GeoModel use half-dimensions for simple solids (e.g. box), GDML uses full dimensions. When reading dimensions from GDML, they must be halved to match the GeoModel shape definition. trd was buggy :-(