Various fixes and updates

Make lines beginning (in markdown files) 'BTW' bold. Rebuilt the
respective html pages.

Slight update to abstract in two entries (1985/shapiro and
1994/shapiro). One is changing 'defines' to '#defines' and the other was
a typo fix.

Fixed make gen_next: added missing new files.

Various fixes in next/register.html (typos and other things).

2020/ferguson2/index.html

@@ -649,7 +649,7 @@ pairs</a>.</p>
 <div id="example">
 <h4 id="example-run">Example run</h4>
 </div>
-<p>BTW: There’s a much more entertaining way to explore this entry. See
+<p><strong>BTW</strong>: There’s a much more entertaining way to explore this entry. See
 <a href="recode.html">recode.html</a> for more details. There’s a secret message that one might like
 to decipher. These however show the general program as well as how to use the
 two winning entries of the <a href="https://en.wikipedia.org/wiki/Morse_code">Morse
@@ -810,7 +810,7 @@ same applies: in C 0-1 but in human it’s 1-2 (technically these were reflector
 the Enigma machine which I display by name in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson2/recode.c">recode.c</a> just like
 with the rotors).</p>
 <p>For more information see <a href="recode.html">recode.html</a>.</p>
-<p>BTW: If you need a reminder to go to the gym just do your Enigma ABCs and it
+<p><strong>BTW</strong>: If you need a reminder to go to the gym just do your Enigma ABCs and it
 should help you remember:</p>
 <pre><code>    $ echo ABC | ./prog
     GYM