Change 'Best of show' to 'Best of Show'

This fixes an inconsistency in case. The spreadsheet in tmp,
year_prize.numbers and the year_prize.csv files were updated also (with
the ./fix_csv.sh run under tmp/).

There was no need to manually update the index.html, any other html
files or .entry.json files as I used sgit(1) to change the case.

2018/index.html

@@ -406,7 +406,7 @@ lacking, you may need to compile using clang or gcc instead of your local
 compiler.</p>
 <h2 id="remarks-on-some-of-the-winning-entries">Remarks on some of the winning entries</h2>
 <p>We believe you will again be impressed with this year’s winning entries.</p>
-<p>The <a href="mills/index.html">Best of show - 2018/mills</a> is an amazing tribute to entries
+<p>The <a href="mills/index.html">Best of Show - 2018/mills</a> is an amazing tribute to entries
 from 1984 and 2015.</p>
 <p>Take a close look at the <a href="hou/index.html">Most likely to top the charts - 2018/hou</a>.
 Observe that while it contains no variables and no operators, it
@@ -487,7 +487,7 @@ See also <a href="../faq.html">the IOCCC FAQ</a> for additional information on t
 <li><a href="ferguson/index.html">2018/ferguson</a> - Best use of weasel words</li>
 <li><a href="giles/index.html">2018/giles</a> - Most unstable</li>
 <li><a href="hou/index.html">2018/hou</a> - Most likely to top the charts</li>
-<li><a href="mills/index.html">2018/mills</a> - Best of show</li>
+<li><a href="mills/index.html">2018/mills</a> - Best of Show</li>
 <li><a href="poikola/index.html">2018/poikola</a> - Most stellar</li>
 <li><a href="vokes/index.html">2018/vokes</a> - Most connected</li>
 <li><a href="yang/index.html">2018/yang</a> - Most shifty</li>