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).

2001/dgbeards/index.html

@@ -476,7 +476,7 @@ the entry win? Because it’s <em>trying</em> to lose.</p>
 <p>Of particular interest is the author’s decision that the program should
 crash if it loses. I’ve played chess with a lot of people like that, and
 I appreciate the realism.</p>
-<p>BTW: if your goal is to lose and you do does that mean you win? :-) What does
+<p><strong>BTW</strong>: if your goal is to lose and you do does that mean you win? :-) What does
 winning mean in a game you’re supposed to lose at?</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <h3 id="faq">FAQ</h3>