esianCalculator</h4>
<ul>
  <li>
New class for calculating Bayesian interval using numerical integration. It implements the IntervalCalculator interface and returns as result a SimpleInterval. 
</li>
<li>The <tt>BayesianCalculator::GetInterval()</tt> method returns a <tt>SimpleInterval</tt> which contains the lower and upper value of the bayesian interval obtained from the posterior probability for the given confidence level.</li>
<li>The class return also the posterior pdf (<tt>BayesianCalculator::GetPoste