Tell on @ when at mindelay (ChrisOelmueller).

As a minor tweak, @ shows the worst-case delay, so that you don't get
told you're at exec axe mindelay at 25.1 Axes skill.

Some of the code can be thrown out when PleasingFungus's shield
reform branch is landed, I think, since then shields won't have a delay
effect on non-UC weapons.