Update demo avoiding the use of obsolete -now removed- initialization of FEA constraint that used  indexes to reference FEA nodes.
Update demo avoiding the use of obsolete -now removed- initialization of FEA constraint that used  indexes to reference FEA nodes.

rserban/chrono,dariomangoni/chrono,Milad-Rakhsha/chrono,rserban/chrono,Milad-Rakhsha/chrono,rserban/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,rserban/chrono,Milad-Rakhsha/chrono,rserban/chrono,projectchrono/chrono,dariomangoni/chrono,projectchrono/chrono,dariomangoni/chrono,Milad-Rakhsha/chrono,rserban/chrono,dariomangoni/chrono,projectchrono/chrono