Usage: <tt>nsample = <i>NS</i> input = [ <i>smin smax nmax</i> ] ComputeSuccessRate</tt>

<p>
Compute the success rate of a given spin configuration stored in array <tt>S</tt>.
by generating paths all starting from <tt>S</tt> via <tt>SampleMCpath</tt>.
<br>
<tt><i>NS</i></tt> is the number of path to be generated.
<br>
Each path is generated by a Monte Carlo simulation from configuration <tt>S</tt>, 
until the average spin value drops below <tt><i>smin</i></tt> (failure), 
or exceeds <tt><i>smax</i></tt> (success),
or if the average number of MC steps exceeds <tt><i>nmax</i></tt>.

<p>
The result is stored in the <tt>nsuccess</tt> variable.

