NonLinearSolver --> projects. Update All CMakeLists

remove main_dgshell.cpp which is now obsolete

NonLinearSolver/space/CMakeLists.txt

-# Gmsh - Copyright (C) 1997-2010 C. Geuzaine, J.-F. Remacle
-#
-# See the LICENSE.txt file for license information. Please report all
-# bugs and problems to <gmsh@geuz.org>.
-
-set(SRC
-  functionSpaceType.h
-)
-
-file(GLOB HDR RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.h) 
-append_gmsh_src(NonLinearSolver/space "${SRC};${HDR}")