Hacked hard :
 * Removed Vukasin Subprocess
 * Fallback to Pipe simple subprocess communication with add_handler()
 * Removed unnecessary ioloop from client program - simplified it a lot
 * Warning : now we have only HALF DUPLEX communication. That means that
    after server starts the program, it can only listens to it. Server
    can not send instructions to program.
 * Cosmetic corrections