Manifest updates

Typo fixes and change 'download entry source' to 'download entry' as
it's the tarball, not the source itself.

Rebuilt .entry.json and index.html files for all entries.

1993/plummer/index.html

@@ -280,7 +280,7 @@ successively larger number to the end of a string.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/plummer/plummer.orig.c">plummer.orig.c</a> - original source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/plummer/try.alt.sh">try.alt.sh</a> - how to run alternative code</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/plummer/try.sh">try.sh</a> - how to run</li>
-<li><a href="1993_plummer.tar.bz2">1993_plummer.tar.bz2</a> - download entry source</li>
+<li><a href="1993_plummer.tar.bz2">1993_plummer.tar.bz2</a> - download entry</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>