Who ever heard of an open casting call for a $110,556-a-year government job in Chicago — a city whose Democratic ward bosses famously said, “We don’t want nobody nobody sent”? But that’s precisely what Mayor Daley is doing before choosing new aldermen in the 1st and 29th Wards. After making 33 aldermanic appointments, most by following the predecessor’s recommendation, he’s posting the equivalent of a “Help Wanted” ad on the Internet.