Remove Chaco and cleaning

CMakeLists.txt

Common/CommandLine.cpp

Common/DefaultOptions.h

Common/Gmsh.cpp

Common/GmshConfig.h.in

Common/Options.cpp

Common/Options.h

Fltk/graphicWindow.cpp

Fltk/partitionDialog.cpp

Geo/GModel.cpp

LICENSE.txt

Mesh/meshGFace.cpp

Mesh/meshPartition.cpp

Mesh/meshPartition.h

Mesh/meshPartitionOptions.h

Mesh/multiscalePartition.cpp

Mesh/multiscalePartition.h

contrib/Chaco/CMakeLists.txt

contrib/Chaco/README.txt

contrib/Chaco/assign/assign.c