fix markdown footnote problem caused by pandoc

Add "<!-- BEFORE: 1st line of markdown file: FILE/PATH -->"
before the markdown content.  This line appears in the
generated HTML.

Add "<!-- AFTER: last line of markdown file: FILE/PATH -->"
after the markdown content.  This line appears in the
generated HTML.

We test a fix relating to problems produced by `pandoc(1)`
when footnotes are added at the end of generated HTML.
This test is made for `2000/bmeyer/index.html`.

Fixed exit 4 in `bin/md2html.sh that should be exit 5.

Changed `bin/md2html.sh` VERSION from to "1.3 2024-04-14"
to "1.4 2024-04-18".

Run `bin/readme2index.sh -v 1 2000/bmeyer` to perform the above.

1985/applin/index.html

@@ -156,6 +156,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
+<!-- BEFORE: 1st line of markdown file: 1985/applin/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make all</code></pre>
 <h2 id="try">Try:</h2>
@@ -178,6 +179,7 @@ certainly takes its time saying hello.</p>
         https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
+<!-- AFTER: last line of markdown file: 1985/applin/README.md -->
 
 <!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->

1985/august/index.html

@@ -151,6 +151,7 @@ Location: <a href="../../location.html#SE">SE</a> - <em>Kingdom of Sweden</em> (
 <!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
+<!-- BEFORE: 1st line of markdown file: 1985/august/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make all</code></pre>
 <h2 id="to-use">To use:</h2>
@@ -189,6 +190,7 @@ anything funny going on with the output?</p>
         https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
+<!-- AFTER: last line of markdown file: 1985/august/README.md -->
 
 <!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->

1985/index.html

@@ -136,6 +136,7 @@
 <!-- END: this line ends content from: inc/before-content.default.html -->
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
+<!-- BEFORE: 1st line of markdown file: 1985/README.md -->
 <h1 id="second-year-of-the-international-obfuscated-c-code-contest">Second year of the International Obfuscated C Code Contest</h1>
 <p>View the <code>index.html</code> web page for the given winning entry for information on how
 to compile it and how to run the winning program. Look at the winning source
@@ -164,6 +165,7 @@ See also <a href="../faq.html">the IOCCC FAQ</a> for additional information on t
         https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
+<!-- AFTER: last line of markdown file: 1985/README.md -->
 
 <!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 22 by: bin/output-year-index.sh via bin/md2html.sh -->

1985/lycklama/index.html

@@ -151,6 +151,7 @@ Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em></l
 <!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
+<!-- BEFORE: 1st line of markdown file: 1985/lycklama/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make alt</code></pre>
 <h2 id="to-use">To use:</h2>
@@ -198,6 +199,7 @@ The program itself looks like tty noise.</p>
         https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
+<!-- AFTER: last line of markdown file: 1985/lycklama/README.md -->
 
 <!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->

1985/shapiro/index.html

@@ -151,6 +151,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
+<!-- BEFORE: 1st line of markdown file: 1985/shapiro/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make all</code></pre>
 <p>There is alternate code which allows one to change the size of the maze. See
@@ -195,6 +196,7 @@ arguments and notice the output.</p>
         https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
+<!-- AFTER: last line of markdown file: 1985/shapiro/README.md -->
 
 <!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->

1985/sicherman/index.html

@@ -151,6 +151,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
+<!-- BEFORE: 1st line of markdown file: 1985/sicherman/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make all</code></pre>
 <p>There is another version that will be compiled in case the first fails. This
@@ -210,6 +211,7 @@ does, then you don’t, so read it again! Explain why:</p>
         https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
+<!-- AFTER: last line of markdown file: 1985/sicherman/README.md -->
 
 <!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 <!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->