add unique id ending function and get full id function

and write ascii data file function

docs/build/html/_modules/numerical/integration.html

@@ -213,10 +213,10 @@
 </ul>
 </div>
 <div id="searchbox" style="display: none" role="search">
-  <h3>Quick search</h3>
+  <h3 id="searchlabel">Quick search</h3>
     <div class="searchformwrapper">
     <form class="search" action="../../search.html" method="get">
-      <input type="text" name="q" />
+      <input type="text" name="q" aria-labelledby="searchlabel" />
       <input type="submit" value="Go" />
     </form>
     </div>
@@ -238,7 +238,7 @@
       &copy;2019, Daniel Weschke.
       
       |
-      Powered by <a href="http://sphinx-doc.org/">Sphinx 2.0.1</a>
+      Powered by <a href="http://sphinx-doc.org/">Sphinx 2.1.2</a>
       &amp; <a href="https://github.com/bitprophet/alabaster">Alabaster 0.7.12</a>
       
     </div>