titem">
            Implemented digamma.
          </li>
<li class="listitem">
            Added more factorial functions.
          </li>
<li class="listitem">
            Implemented the Hermite, Legendre and Laguerre polynomials plus the spherical
            harmonic functions from TR1.
          </li>
<li class="listitem">
            Moved Xiaogang Zhang's elliptic integral code into the library, and brought
            them into line with the rest of the code.
          </li>
<li class="listitem">
  