Define canMoveCards() for Hanafuda sequence stacks

Any stack of Hanafuda cards is always deemed movable, even if it is out
of sequence.  The effect can easily be seen a game such as Firecracker,
where:

 - Any stack can be dragged as a whole (but not released)
 - "Highlight piles" will highlight everything
 - Asking for a hint will ignore most valid moves

This is due to Hanafuda_SequenceStack lacking a canMoveCards() method.

pysollib/games/ultra/hanafuda_common.py

@@ -286,6 +286,9 @@ def acceptsCards(self, from_stack, cards):
             return cards[0].rank == 0 or self.cap.base_rank == ANY_RANK
         return self.isHanafudaSequence([stackcards[-1], cards[0]])
 
+    def canMoveCards(self, cards):
+        return self.basicCanMoveCards(cards) and self.isHanafudaSequence(cards)
+
 
 class Oonsoo_SequenceStack(Flower_OpenStack):
 
@@ -298,6 +301,9 @@ def acceptsCards(self, from_stack, cards):
             return cards[0].rank == 0 or self.cap.base_rank == ANY_RANK
         return self.isHanafudaSequence([stackcards[-1], cards[0]], 0)
 
+    def canMoveCards(self, cards):
+        return self.basicCanMoveCards(cards) and self.isHanafudaSequence(cards, 0)
+
 
 class FlowerClock_RowStack(Flower_OpenStack):