Write atomic position into atomtv format with file name specified
by  <tt>finalcnfile</tt>.  Each ine of the file contains

<p>
<tt>R[i].x R[i].y R[i].z EPOT_IND[i] TOPOL[i]</tt>

<p>
By default all atoms are exported, but a subset of atoms can be selected
by the <tt>plot_color_windows</tt> and <tt>plot_limits</tt> variables.
