If <tt>conj_fixbox = 0</tt>, we may still fix individual components of
the box matrix <b>H</b> during the conjugate gradient relaxation
(invoked by the <tt>relax</tt> command).

<p>
Format: <tt>conj_fixboxvec = [  
<br> &nbsp; &nbsp; &nbsp; <i>f</i><sub>11</sub>   <i>f</i><sub>12</sub> <i>f</i><sub>13</sub>
<br> &nbsp; &nbsp; &nbsp; <i>f</i><sub>21</sub>   <i>f</i><sub>22</sub> <i>f</i><sub>23</sub>
<br> &nbsp; &nbsp; &nbsp; <i>f</i><sub>31</sub>   <i>f</i><sub>32</sub> <i>f</i><sub>33</sub> ] </tt>

<p>
If <tt><i>f</i><sub>ij</sub> == 1 </tt>, then H<sub>ij</sub> is fixed.

