new file:   c_potissimum/_client
	updated client uses boost sockets  :  c_potissimum/client.cpp (under construction)
	modified:   c_potissimum/start_client.sh
	new file:   s_potissimum/_server
	updated server uses boost sockets and c++11 threads :   s_potissimum/server.cpp (under construction)
   The necessary keys to compile both server and client : keys_to_compile_with
    The necessary keys for g++ to compile both client and server : keys_to_compile_with