The Canadian slaughter of newborn seals, which a quarter-century ago spawned international protests, economic boycotts, and, ultimately, the demise of this springtime ritual, has been quietly resurrected, with government officials determined to pacify the fishermen who engage in this deadly off-season activity. But if the world is largely unaware that the hunters are again brandishing their clubs, Rebecca Aldworth, who grew up amidst these fishermen, is determined to open people