Fix more degenerated cases in extrusion

Common/Context.h

Common/DefaultOptions.h

Common/GetOptions.cpp

Common/Options.cpp

Common/Options.h

Fltk/GUI.cpp

Geo/CAD.cpp

Graphics/Draw.h

Graphics/Mesh.cpp

Mesh/3D_Extrude.cpp

Mesh/Create.cpp

Mesh/Create.h

Mesh/Generator.cpp

Mesh/Mesh.h

Mesh/Print_Mesh.cpp

Mesh/Read_Mesh.cpp

Motif/CbGeneral.cpp

Motif/Info.h

Motif/Widgets.h

doc/VERSIONS