 <b>I4VEC_HEAP_D</b> reorders an I4VEC into an descending heap.
        </li>
        <li>
          <b>I4VEC_MIN</b> computes the minimum element of an I4VEC.
        </li>
        <li>
          <b>I4VEC_SORT_HEAP_A</b> ascending sorts an I4VEC using heap sort.
        </li>
        <li>
          <b>I4VEC_SORTED_UNIQUE</b> finds the unique elements in a sorted I4VEC.
        </li>
        <li>
          <b>LRLINE</b> determines if a point is left of, right or, or on a directed line.
        </li>
       