Fixes in 1986, manifest update

The html files in 1986 (including 1986/marshall/compilers.html) look and
feel good. Format change (slight) in 1986/marshall/index.html.

The manifest update includes a fix for 1986/hague and this same change
in entry_text applies to files in a few other years as well.

1986/marshall/index.html

@@ -403,7 +403,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- BEFORE: 1st line of markdown file: 1986/marshall/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make all</code></pre>
-<p>NOTE: we FORCE disable the optimiser due to a funny problem with different
+<p>NOTE: we <strong>FORCE</strong> disable the optimiser due to a funny problem with different
 compilers and systems. See below and <a href="compilers.html">compilers.html</a> for details.</p>
 <p>There is an <a href="#alternate-code">alternate version</a>. The reason is a funny problem:
 in modern systems, depending on the platform, compiler and the optimiser, it