Overwrite __repr__ function of each object class for better print
move config object to be with other object class
offer more info when the value of a parameter cannot be set'
add tester for hSub
make para getter of a method obj return default para obj if it cannot find the para
make method getter of a handler obj return default method obj if it cannot find the method
make repr prints in better form
make robot getter of a config obj return default robot obj if it cannot find the robot
pass executor object to hSub
still pass proj into hsub for now. reduce fail to import handler logging to warning