Nary the minimalist, Mariah Carey descended upon midtown Manhattan Tuesday in a cloud of perfume. She calls it 'M.'Thousands watched inside Macy's at Herald Square, as Carey in a black minidress and sunglasses briskly walked down a purple carpet runway, waggled her fingers hello, and entered a VIP tent. Her new perfume, a flowery scent, is supposed to evoke gardenias, Moroccan incense, and burnt marshmallows. Inside, after a brief photo session, she sat on a white Louis IV-style chair to sign autographs....
