Clarify name of guard function from 3d56e026, add it globally

Clarify name of guard function from 3d56e026, add it globally

Instead of just marking all my DESTROYs with the function, just add it to a
base class, thus capturing *everything* there is to find. Yes it will be a
tad slower. And yes it will have a massive benefit to any DBIC user happening
to be caught in an unfriendly app-space