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).

thanks-for-help.html

@@ -1456,7 +1456,7 @@ generated <code>fibonacci.c</code> actually works; before it just printed <code>
 again (since it did not work anyway a segfault prevention was added here). He
 also fixed some array addressing (some of which might not be strictly necessary
 but as he was testing the <code>fibonacci.c</code> bug he ended up changing it anyway).</p>
-<p>BTW: why can’t the fix:</p>
+<p><strong>BTW</strong>: why can’t the fix:</p>
 <pre><code>    if (a[1]==NULL||a[2]==NULL||a[3]==NULL||a[4]==NULL||a[5]==NULL) return 1;</code></pre>
 <p>be changed to just test the value of <code>A</code> when <code>a</code> is argv and <code>A</code> is argc? You
 tell us!</p>
@@ -2457,7 +2457,7 @@ possible to get this to compile.</p>
 <p>Cody also added the rather useful <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1996/gandalf/try.sh">try.sh</a> script to
 really demonstrate the different ways of running the program ends up showing
 either different output or the same output that we briefly pointed out.</p>
-<p>BTW: it is perilous to try the patience of
+<p><strong>BTW</strong>: it is perilous to try the patience of
 <a href="https://www.glyphweb.com/arda/g/gandalf.html">Gandalf</a>. Go ahead, try it! :-)</p>
 <p>Jump to: <a href="#">top</a></p>
 <div id="1996_huffman">