force use of pandoc version >= 3.1.12.2

The `bin/pandoc-wrapper.sh` tool will verify that the ssytem
has a recent enough version of `pandoc(1)`.

We explain why we insist on `pandoc(1)`. version >= 3.1.12.2
in comments where the $PANDOC_MIN_VERSION is set.

Added `--wrap=preserve` as a default argument to `pandoc(1)`.
While this change will impact every HTML file generated,
we believe this will improve the ability of someone to look
at the generated HTML and correlate with the original markdown.

Changed `bin/pandoc-wrapper.sh` VERSION from "1.4.2 2024-03-17"
to "1.4.3 2024-03-18".

Performed `make www` to achieve all of the above and to generate
HTML using the new  `--wrap=preserve` `pandoc(1)` mode.

1993/ejb/hanoi.html

@@ -121,14 +121,15 @@
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
 <h1 id="the-towers-of-hanoi-puzzle">The Towers of Hanoi puzzle</h1>
-<p>The Towers of Hanoi is a puzzle consisting of three posts and several
-rings of various sizes. The initial configuration of the game is that
-all the rings are stacked in decreasing order of size on one post. The
-object of the game is to move all the rings from one post to another
-subject to two rules: only one ring can be moved at a time, and at no
-time can one ring be placed on top of a smaller ring. The number of
-steps necessary to solve this puzzle is exponential in the number
-rings.</p>
+<p>The Towers of Hanoi is a puzzle consisting of three posts
+and several rings of various sizes. The initial
+configuration of the game is that all the rings are stacked
+in decreasing order of size on one post. The object of the
+game is to move all the rings from one post to another
+subject to two rules: only one ring can be moved at a time,
+and at no time can one ring be placed on top of a smaller
+ring. The number of steps necessary to solve this puzzle is
+exponential in the number rings.</p>
 
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