[Arguments] name(optional) [Return Value] Success or Failure [Description] Removes a scope from the scope stack. If no name is provided, the topmost scope is removed. Otherwise the scope with provided name is removed. A Failure status is returned if the stack is empty or no scope with the specified name exists. [Function] 
DeleteScope
C r e a t e S c o p e
D e l e t e S c o p e
C r e a t e V a r i a b l e
D e l e t e V a r i a b l e
U p d a t e V a r i a b l e
R e a d V a r i a b l e
E v a l u a t e E x p r e s s i o n