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).

1984/mullender/README.md

@@ -40,7 +40,7 @@ start over once it times out or if one hits a key.
 Note that the microseconds is argc and it uses `atoi()` which does NOT check for
 overflow!
 
-BTW: is there such a thing as too fast a CPU ? :-) Actually yes for certain code
+**BTW**: is there such a thing as too fast a CPU ? :-) Actually yes for certain code
 which is probably not as uncommon as you think :-).
 
 
@@ -114,7 +114,7 @@ couldn't!  :-)
 
 What happens if you hit enter after it writes a line of output?
 
-BTW: to this day, 2023, this remains one of my (Landon Curt Noll's) all time
+**BTW**: to this day, 2023, this remains one of my (Landon Curt Noll's) all time
 favorite entries!