Reconstruct the Verlet neighborlist (by first constructing the cell list) if necessary.
If the maximum displacement among all atoms since the last neighbor list construction
(i.e. max<sub>i</sub> |R(i) - R0(i)|) is less than <tt>SKIN</tt> / 2, then there is
no need to reconstruct the neighbor list.

<p>
Also see <tt>R0</tt>, <tt>SKIN</tt>.
