Fixes #77 so that nested groups are preserved by power graph compression
Fixes #77 so that nested groups are preserved by power graph compression

repos-viz/WebCola,mathn/WebCola,timelyportfolio/WebCola,davkal/WebCola,cpsloal/WebCola,nchen63/WebCola,cpsloal/WebCola,gordonwoodhull/WebCola,shusenl/WebCola,timelyportfolio/WebCola,gdseller/WebCola,kevinmcalear/WebCola,nchen63/WebCola,timelyportfolio/WebCola,tgdwyer/WebCola,davkal/WebCola,cpsloal/WebCola,BordRGal32/WebCola,tgdwyer/WebCola,gordonwoodhull/WebCola,davkal/WebCola,timelyportfolio/WebCola,maxint137/WebCola,gordonwoodhull/WebCola,maxint137/WebCola,gdseller/WebCola,shusenl/WebCola,nchen63/WebCola,mathn/WebCola,mathn/WebCola,maxint137/WebCola,shusenl/WebCola,tgdwyer/WebCola,gdseller/WebCola,kevinmcalear/WebCola,kevinmcalear/WebCola,repos-viz/WebCola,BordRGal32/WebCola,repos-viz/WebCola,BordRGal32/WebCola