Cathy Mincberg, the longtime political semi-honcho who once was HISD's board president and left the district as its chief business officer, is now leaving her latest gig.She had been chief operations officer of the Portland school system, but now she is becoming the V-P and chief academic officer for, ummm, an online-learning company. Or, as the Portland press release puts it, "one of the oldest online education companies in the nation."A real leader in the long and glorious tradition of online