[feature request] Stop certain inputs at a circle

[leotulipan]

I made a complex system here http://bit.ly/2o2KbM5

If I look at one of the circles as a bucket that gets more and more full, the following features would be useful

1. Have an inc/dec stop at one of the buckets. eg. I have a dec Movement => Muskelprotein But this means it gets used up and should not continue into the cycle
2. Only continue an ouput (inc arrow) when the bucket is full/about to overflow. so the cycle does not continue automatically but only after it reaches a certain point

[1000i100]

does my addition in #20 match your need ? you can try it here : https://1000i100.github.io/loopy/v1.1/ and import your system (not breaking any compatibility)