Maintains the resource usage at all time the resource listens to the jobs using it, and maintains its overshoot times, and first overshoot
this class loads JobShop p^roblems as defined in http://people.brunel.ac.uk/~mastjjb/jeb/orlib/files/jobshop1.txt one problem per file
a simple model of Reagan president of USA he is partly multitask, can do two things at the same time, except eating, which requires his full attention he needs to sleep 2H, eat 30', chew 45' and think 3H he cannot sleep before having eaten