Sure, there's buried treasure to be found, but nobody's digging up anything until Bonney Anne quits her caterwauling. So, quicker than you can say "scurvy dog," Braid Beard and his swashbuckling pirates become . . . babysitters? Blimey!     This hilarious companion to How I Became a Pirate reveals that minding the nursery can be even more terrifying than walking the plank--especially if you're a pirate.