removed gsolver namespace

Common/Gmsh.cpp

Geo/GFace.cpp

Geo/GFaceCompound.cpp

Geo/Geo.cpp

Geo/MElement.cpp

Geo/MElement.h

Geo/MElementCut.h

Geo/MLine.cpp

Geo/MLine.h

Geo/MTetrahedron.cpp

Geo/MTetrahedron.h

Geo/MTriangle.cpp

Geo/MTriangle.h

Geo/SOrientedBoundingBox.cpp

Geo/STensor3.cpp

Geo/STensor3.h

Mesh/BDS.cpp

Mesh/DivideAndConquer.cpp

Mesh/HighOrder.cpp

Mesh/gmshSmoothHighOrder.cpp