enable option to switch optimum bars

[patrickmohrmann]

in many systems the healthrating is not going down from healty to dead, but the other way around. it would be nice not just to change the colors, but the level of the --sub-sub-optimum as well because having 0 damage means I'm healthy, but a percentage up to something like 10% would be nicer

I would love to have an option to switch between going down with hitpoints or going up