more OCC shape creation + removed SGEOM factory

CMakeLists.txt

Geo/CMakeLists.txt

Geo/GModel.cpp

Geo/GModel.h

Geo/GModelFactory.cpp

Geo/GModelFactory.h

Geo/GModelIO_OCC.cpp

Geo/GModelIO_OCC.h

Geo/GModelIO_SGEOM.cpp

Geo/GModelIO_SGEOM.h

Geo/SGEOMIncludes.h

Parser/Gmsh.l

Parser/Gmsh.tab.cpp

Parser/Gmsh.tab.hpp

Parser/Gmsh.y

Parser/Gmsh.yy.cpp

benchmarks/boolean/neuron.geo

benchmarks/boolean/wikipedia.geo