Fix tgamma_delta_ratio for cases where the delta is small compared to the
          base.
        </li>
<li class="listitem">
          Fix misc GCC-4.4 test failures.
        </li>
</ul></div>
<h5>
<a name="math_toolkit.history1.h15"></a>
      <span class="phrase"><a name="math_toolkit.history1.math_2_4_0_boost_1_61"></a></span><a class="link" href="history1.html#math_toolkit.history1.math_2_4_0_boost_1_61">Math-2.4.0
      (Boost-1.61)</a>
    </h5>
<p>
      New Features:
    </p>
<div class="itemizedli