For every atom <tt>k</tt>, update its scaled coordinates from its real coordinates.

<p>
 <b>s</b><sub>k</sub> = inv(<b>H</b>) &sdot; <b>r</b><sub>k</sub>.

<p>
This command must be called if you have changed the real coordinates <tt>R</tt> manually, 
because MD++ always computes the real coordinates from the scaled coordinate 
inside the potential function.

<p>
Also see <tt>SHtoR</tt>.


