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).

next/guidelines.html

@@ -1883,7 +1883,7 @@ known as the “<strong>obfuscated Peter Honeyman paradox</strong>”. Should Pe
 actually submit to the IOCCC, he alone is excluded from the above, as we
 will likely believe it’s just another attempt at confusion. This <em>guideline</em> is
 known as the “<strong>Peter Honeyman is exempt</strong>” <em>guideline</em>.</p>
-<p>BTW: None of the entries claiming to be from Peter Honeyman have ever
+<p><strong>BTW</strong>: None of the entries claiming to be from Peter Honeyman have ever
 won an award. So it is theoretically possible that Peter Honeyman
 did submit to the IOCCC in the past. In the past, Peter had denied
 submitting anything to the IOCCC. Perhaps those entries were