Reported by entrez, restoring a saved game runs the shop wall/floor
damage repair routine. It was taking place before attached ball
and chain were fully restored so the repair routine treated them as
ordinary objects if they happened to be in a wall gap that gets
fixed on the same turn as restore takes place. They could end up
being moved to a spot that's too far from the hero and then trigger
an impossible "b&c distance".
This restores ball and chain before shop damage repair takes place
so the repair routine deals with them sanely and the impossible won't
occur any more. However, the repair still happens before the current
level's map has been displayed and that looks pretty strange during
the shopkeeper's message. Also, if the hero and the ball start on
opposite sides of the gap, after the gap is repaired the ball will
still be shown as a remembered object at its old spot even though it
ends up being located at the hero's feet.
Closes#726
but more work is needed...
dadbea1d8c