Cats in delis: they are ubiquitous, loved, objected to, necessary, and illegal. City inspectors are constantly on the prowl to ferret out deli felines, but deli owners say they are necessary fixtures to keep their businesses free of pests like mice, rats, and roaches. The New York Times has a story today on the ongoing battle between the city and the cats that are the sentinels of its delis--feline samurai who serve their masters in......