New text primitives in views

Common/DefaultOptions.h

Common/Options.cpp

Common/Options.h

Common/Views.cpp

Common/Views.h

Fltk/Callbacks.cpp

Fltk/GUI.cpp

Graphics/Draw.cpp

Graphics/Draw.h

Graphics/Graph2D.cpp

Graphics/Post.cpp

Parser/Gmsh.l

Parser/Gmsh.tab.cpp

Parser/Gmsh.tab.cpp.h

Parser/Gmsh.y

Parser/Gmsh.yy.cpp

benchmarks/misc/charts.geo