Introduce GeoModelToGdml: gmtogdml
gmtogdml is a command line tool to convert geometries and dump them in gdml. The geometry is first built in GeoModel, converted in Geant4 and dumped in gdml format. The supported input geometries are : sqlite (.db), plugin (.so/dylib) and gdml. Before the dump operation the geometry is revised and the unidentified volumes are pulled from the geometry.