better implementation of Machine.releaseOperator
correction in Operator.postProcessing
better implementation in shiftscheduler
Operator to be able to release current work in the end of shift
one test added
Machine to be able to continue when operator is back
test added
one more test added
Operator to be able to lock and not undertake jobs when near the end of shift
empty
test with operator not taking job because he is locked
interrupt only victims that wait for interruption signal