Tests in g3tog4: 
=================
  leading to warning, exception, error;
  
1) implementation in Geant4

  G4gsmate:
    dens < G3_minimum_density   => density set to G3_minimum_density;
                                   no WARNING message
    z<1                         => Z = 1.; A = 2.;
                                   no WARNING message

  G4gstmed:
    nbuf > 0                    => additional user defined parameters
                                   are ignored
				   WARNING message
    
    Only STEMAX (max allowed step) is used in Geant4 tracking
    the other parameters (IFIELD, FIELDM, TMAXFD, DEEMAX, EPSIL, STMIN)
    are ignored by Geant4.			   

  G4gsrotm:
    1-abs((x.cross(y))*z)>tol      ortogonality test
                                   => EXCEPTION
    (1+(x.cross(y))*z)<=tol        check for left-handedness
                                   => WARNING message  
				      -> may cause incorrect visualization	
			       
  G4gstpar:
    not implemented;
			       
  G4gsvolu:
     Unsupported shapes:
     "ELTU", "HYPE", "GTRA", "CTUB"  => EXCEPTION  
     
  G4gsdvn, G4gsdvn2, G4gsdvt, G4gsdvt2, G4dvx: 				   
    Supported shapes(axes):
      "BOX"(1,2,3), "TUBE"(1,2,3), "TUBS"(1,2,3),
      "CONE" (2,3), "CONS" (2, 3),
      "TRD1"(3),  "TRD2"(3), "TRAP"(3), "PGON"(2), "PCON"(2),
    Unsupported shapes:
      "SPHE", "PARA", "ELTU", "HYPE", "GTRA", "CTUB"
    
    call to unsupported shape/axis  =>  WARNING message
    
  G4gspos, G4gsposp:
      Unsupported option: "MANY"    =>  WARNING message
                                        !! may cause intersecting volumes

2) implementation in TGeant4

  TG4GeometryManager::Material:
    G4gsmate - from G4

  TG4GeometryManager::Gfmate:
    GetEffA, GetEffZ:
      nofElements > 1             => Effective Z, A for material mixture
                                     is used
                                     WARNING message
				    
  TG4GeometryManager::Medium:
    G4gstmed - from G4
      nbuf > 0                    => additional user defined parameters
                                     are ignored

  TG4GeometryManager::Matrix:
    TG4gsrotm - from G4
			       
  TG4GeometryManager::Gstpar
  TG4gstpar:
    currently supported parameters:
    Cuts:
      "CUTGAM", "BCUTE", "BCUTM", "CUTELE", "DCUTE", "DCUTM", "CUTNEU",
      "CUTHAD", "CUTMUO", "PPCUTM"
           implemented as dummy: "PPCUTM"   
    Processes:
      "PAIR", "COMP", "PHOT", "PFIS", "DRAY", "ANNI", "BREM", "HADR",
      "MUNU", "DCAY", "LOSS", "MULS"
           implemented as dummy:    "PFIS", "HADR"
	   need more investigation: "DRAY", "LOSS"
	        (Current implementation (in)activate Ionization according
		 to the DRAY flag and ignores LOSS.)		 

    for the others                   => WARNINGS
                                        -> parameters are ignored
			       
  TG4GeometryManager::Gsvolu:
    G4makevol - from G4
     
  TG4GeometryManager::Gspos, Gsposp:
    G4gspos, G4gsposp - from G4

  TG4GeometryManager::Gsdvn, Gsdvn2, Gsdvt, Gsdvt2, Gsdvx:
    G4gsdvn, G4gsdvn2, G4gsdvt, G4gsdvt2, G4dvx - from G4