By Eric M. Johnson SEATTLE (Reuters) - A U.S. soldier charged with killing 16 civilians, most of them women and children, near his Army post in Afghanistan last year is set to appear at a pre-trial hearing on Tuesday, as lawyers prepare a defense based on his mental state. Prosecutors are seeking the death penalty against Robert Bales, a decorated veteran of four combat tours in Iraq and Afghanistan accused of gunning down Afghan villagers during two rampages through their family compounds in Kandahar province in March 2012. ...

