add Geant namespace

src/HEP/Geant/Solid.h

@@ -9,7 +9,7 @@
 
   ------------------------------------------------------------------
   This library is free software;  you  can  redistribute  it  and/or
-  modify it  under the  terms  of  the  GNU  Lesser  General  Public
+  modify it  under  the  terms  of  the  GNU  Lesser  General  Public
   License as published  by  the  Free  Software  Foundation;  either
   version 3.0 of the License, or (at your option) any later version.
 
@@ -39,6 +39,7 @@ class G4TessellatedSolid;
 class G4Box;
 
 namespace uLib {
+namespace Geant {
 
 class Solid : public Object {
 public:
@@ -109,6 +110,7 @@ private:
   G4Box *m_Solid;
 };
 
+} // namespace Geant
 } // namespace uLib
 
 #endif // SOLID_H