ALL_LTTactical.ALL_LT : list_tactic
Passes on a goal list unchanged.
ALL_LT applied to a goal list gl simply
produces the goal list gl. It is the identity for the
THEN_LT tactical.
Never fails.
To apply tactic tac1 to a goal, and then to apply
tac2 to all resulting subgoals except the first, use
tac1 THEN_LT SPLIT_LT 1 (ALL_LT, ALLGOALS tac2)