Rotate the simulation box <tt><b>H</b> = [<b>c</b><sub>1</sub> |
 <b>c</b><sub>2</sub> | <b>c</b><sub>3</sub> ] </tt> so that
 <tt><b>H</b></tt> is an upper triangle matrix.  This means that
 <b>c</b><sub>1</sub> is parallel to the x-axis, and <b>c</b><sub>2</sub>
 is on the x-y plane.

<p>
The scaled coordinates are not changed so that the real coordinates
are rotated by this operation.

  
