parser is now optional

Common/CommandLine.cpp

Common/Gmsh.cpp

Common/Makefile

Common/StringUtils.cpp

Common/StringUtils.h

Common/Visibility.cpp

Fltk/Callbacks.cpp

Fltk/GUI_Projection.cpp

Fltk/Makefile

Fltk/Solvers.cpp

Geo/GModelIO_Geo.cpp

Geo/GModelIO_OCC.cpp

Geo/Geo.cpp

Geo/GeoStringInterface.cpp

Geo/Makefile

Graphics/Makefile

Mesh/Makefile

Parser/CreateFile.cpp

Parser/CreateFile.h

Parser/Gmsh.tab.cpp