Usage: <tt>input = [ <i>dir</i> ] splicecn</tt>

<p>
Put the configuration stored in <tt>incnfile</tt> next to the configuration in memory
(in array <tt>SR</tt>) along the direction <tt><i>dir</i></tt> (1, 2, 3 for x, y, z).
The <tt><i>dir</i></tt>-th column of the <tt>H</tt> matrix is incremented by the 
amount specified in <tt>incnfile</tt>.

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