Updated Solver and Eng Screen

Updated solver with new code from Lucy.  Added config tab to eng
screen.  Commented out a few lines of mainwidget.  Changed ints to
floats in prod/cons data structure
It didn't commit all of my changes last commit

Updated solver with new code from Lucy.  Added config tab to eng
screen.  Commented out a few lines of mainwidget.  Changed ints to
floats in prod/cons data structure