Fix bug where measurements were not printed in the correct order when steady state...

Fix bug where measurements were not printed in the correct order when steady state was not attained

ss->head points to the beginning of the buffer up through the point where the buffer is filled for the first time. afterwards, when a new element is added, ss->head is advanced to point to the second element in the buffer. if steady state is attained upon adding a new element, ss->head is not advanced so it actually does point to the head of the buffer.