Allergan Inc. (NYSE:AGN) received written requests from its shareholders who are calling for a special meeting in regards to Valeant Pharmaceutical International Inc.’s intent to acquire Allergan.  Valeant Pharmaceuticals Intl Inc (NYSE:VRX), and Pershing Square Capital Management are chasing Allergan Inc. with a $54 billion deal in hand. Valeant Pharmaceuticals Intl Inc (NYSE:VRX) wants Allergan Inc.…