git mv *.hint -> README.md

There is one exception:

    $ find . -name '*.hint' -execdir git mv '{}' README.md \;
    git statufatal: destination exists, source=1992/albert/albert.hint, destination=1992/albert/README.md

Looking at the two files they differ quite a bit so I've not changed it.
I'll bring this up on GitHub.

2000/primenum/README.md

@@ -0,0 +1,75 @@
+Best Abuse of CPP:
+
+    Raymond Cheong
+    [address subject to change]
+    MD, USA
+
+
+Judges' Comments:
+
+    To build:
+
+	make primenum
+
+    To run:
+
+	./primenum n (where n is an integer)
+
+    Don't read the author comments until you're ready for the spoiler.
+    Just stop and read the program; it won't take long.  Once you've figured
+    out what it does, run it.  It may surprise you.
+
+    This entry won, not because the obfuscation is impenetrable, but because
+    it successfully fooled half of the judges, including me.
+
+
+Selected Author's Comments:
+
+    Description
+    ===========
+
+    For 15 years, IOCCC winners have obfuscated programs using esoteric,
+    difficult-to-interpret, confusing algorithms.  This entry finally bucks
+    that trend and obfuscates in the most "obvious" way possible: by
+    painstakenly describing the algorithm in clear pseudocode.  Even novice
+    programmers will recognize that the program should find and print prime
+    numbers up to a given number (as specified on the command line).
+
+    But novice programmers especially know that mistakes are often made in
+    translating pseudocode to real code, often resulting in programs with
+    unexpected and confusing output.  Clearly, the program contains several
+    syntax "mistakes" (e.g. LessThanOrEqualTo) and blatant "errors" (e.g.
+    Zero).  This program clearly requires "debugging."
+
+    As a result of these "bugs", the program does not primes at all.
+    Instead, the program reads input from stdin and returns garbled text on
+    stdout.  Fortunately, you can recover the original message simply by
+    running the program a second time.  Try:
+
+        ./primenum n < textfile | ./primenum n > textfile2
+        diff textfile textfile2
+
+    where n is the same number (modulo 64).  So, the prime number generator
+    is actually a simple text encoder/decoder!  Of course, don't forget that
+    argument, otherwise the "bugs" in the program will cause it to crash!
+
+    Features
+    ========
+
+    - The program attempts to mislead the reader into thinking that it
+      generates prime numbers.  It does this by
+        o describing a correct algorithm in pseudocode,
+        o using partially correct conversion of pseudocode to real code,
+        o using suggestive variable names, and
+        o using a suggestive program name.
+    - The program demonstrates a novel method of abusing the C preprocessor.
+    - How the filter algorithm works is left as an exercise to the reader.
+    - OK, so running it through the preprocessor strips away the prime
+      number front.  But ye be warned: not a11 variab1es1es are identica1 :-)
+    - Other features include
+        o useless variables
+        o useless if
+        o a for loop that's used as an if statement
+        o dependence on the high bit being 0
+    - Try also
+      echo THIS MESSAGE IS IN ALL CAPS | primenum 32