README.md and Makefile files from various years

These are mostly just formatting fixes but there might be some typos
here and there.

These years have not been checked thoroughly but I made fixes and want
them in for when I do work on them.

As far as the Makefiles go: notes were added that correspond to the
notes in the README.md files which is why I have put them in the same
commit.

1996/dalbec/README.md

@@ -11,61 +11,64 @@
 
         make all
 
-	NOTE: This entry uses non-standard args to main() that do not work with modern compilers.
+NOTE: This entry uses non-standard args to main() that do not work with modern compilers.
 
-### To run
+## To run:
 
 	./dalbec
 
-## Judges' comments
+## Try:
 
-    The output is mis-leading ... why does it also print 2047?
-
-    Also try:
 
 	./dalbec 3
 
-    why does it output 121?
+Why does it output 121?
 
-    For a hint see:
 
-	http://www.utm.edu/research/primes/prove2.html#sprp
+## Judges' comments:
 
-    and then try to understand the source!  :-)
+The output is mis-leading ... why does it also print 2047?
 
-    We (the judges) recommend that you take the time needed to understand
-    how this program works.  The source is small enough to make the effort
-    reasonable, and complex enough to make it interesting.
+For a hint see
+[https://web.archive.org/web/20000510191341/https://www.utm.edu/research/primes/prove2.html](https://web.archive.org/web/20000510191341/https://www.utm.edu/research/primes/prove2.html).
+
+
+... and then try to understand the source!  :-)
+
+We (the judges) recommend that you take the time needed to understand
+how this program works.  The source is small enough to make the effort
+reasonable, and complex enough to make it interesting.
 
 ## Author's comments
 
-    This program assumes that your terminal wraps lines automatically.
-    If this is not the case, you may need to change the space in the
-    "printf" format string to a newline character.
+This program assumes that your terminal wraps lines automatically.
+If this is not the case, you may need to change the space in the
+"printf" format string to a newline character.
 
-    An extra feature of this program is that it allows you (in most
-    cases) to estimate the stack space available to programs on your
-    system.  Simply allow the program to run to completion.  The stack
-    space is roughly proportional to the last number printed.
+An extra feature of this program is that it allows you (in most
+cases) to estimate the stack space available to programs on your
+system.  Simply allow the program to run to completion.  The stack
+space is roughly proportional to the last number printed.
 
-	 (On SunOS/cc, the proportionality constant is about 48 bytes.)
+(On SunOS/cc, the proportionality constant is about 48 bytes.)
 
-    On completion, the program produces a core file that may be used to
-    refine this estimate.  (Or you could try typing "limit" if you're
-    running csh.) In rare cases the stack space may exceed 24*MAXINT
-    bytes, in which case the program will produce an inaccurate estimate.
+On completion, the program produces a core file that may be used to
+refine this estimate.  (Or you could try typing "limit" if you're
+running `csh`.) In rare cases the stack space may exceed `24*MAXINT`
+bytes, in which case the program will produce an inaccurate estimate.
 
-    This program is obfuscated:
+This program is obfuscated:
 
-    (1) by the use of easily-confused variable names
+1. by the use of easily-confused variable names
 
-    (2) by using the implicit !=0 in conditional expressions
+2. by using the implicit !=0 in conditional expressions
 
-    (3) by substituting expressions such as !a for 0 where a!=0
-                                        and !a for 1 where a==0
+3. by substituting expressions such as !a for 0 where a!=0 and !a for 1 where a==0
 
-    (4) by the fact that main() is a single expression and so beautifies poorly
+4. by the fact that main() is a single expression and so beautifies poorly
 
-    (5) by the fact that main() is used
-        (a) to compute powers in modular arithmetic
-        (b) to recursively call itself in the main loop
+5. by the fact that main() is used
+
+    - to compute powers in modular arithmetic
+
+    - to recursively call itself in the main loop