Fix backwards compatibility issue with magnetic field name conventions

DDCore/src/plugins/Compact2Objects.cpp

@@ -148,6 +148,8 @@ static Ref_t create_SolenoidField(lcdd_t& lcdd, xml_h e)  {
   obj.assign(ptr,c.nameStr(),c.typeStr());
   return obj;
 }
+DECLARE_XMLELEMENT(SolenoidMagnet,create_SolenoidField);
+// This is the plugin required for slic: note the different name
 DECLARE_XMLELEMENT(solenoid,create_SolenoidField);
 
 static Ref_t create_DipoleField(lcdd_t& /* lcdd */, xml_h e)  {

DDCore/src/plugins/LCDDConverter.cpp

@@ -1166,7 +1166,7 @@ static long create_visASCII(LCDD& lcdd, int argc, char** argv)   {
   return 1;
 }
 
-DECLARE_APPLY(DD4hepGeometry2VIS, create_vis);
+DECLARE_APPLY(DD4hepGeometry2VIS,      create_vis);
 DECLARE_APPLY(DD4hepGeometry2VISASCII, create_visASCII);
-DECLARE_APPLY(DD4hepGeometry2GDML,create_gdml);
-DECLARE_APPLY(DD4hepGeometry2LCDD,create_lcdd);
+DECLARE_APPLY(DD4hepGeometry2GDML,     create_gdml);
+DECLARE_APPLY(DD4hepGeometry2LCDD,     create_lcdd);