Change heading level of 'Original code'

In the case where we recommend trying the alternate code first, the
lower section is 'Original code' but this was at heading level 3 when
discussion suggests 2 so this was done as well:

    sgit -e 's/^### \(Original code\)/## \1/g' '*README.md'

1985/lycklama/README.md

@@ -56,7 +56,7 @@ which would set it at 700. Then, whether you use the default value or not, try:
 
 ```
 
-### Original code:
+## Original code:
 
 As explained above, because modern systems run this entry way too fast to fully
 appreciate what it does, we encourage you to first try the alternate version.

1996/eldby/README.md

@@ -35,7 +35,7 @@ make CFLAGS+="-DZ=20000" clobber alt
 ./eldby.alt
 ```
 
-### Original code:
+## Original code:
 
 Besides the fact that modern systems make it impossible to see what this program
 does the rapid movement can be a problem for some people. It is for these

2006/sloane/README.md

@@ -41,7 +41,7 @@ make CDEFINE="-DS=0" clobber alt
 ./sloane.alt
 ```
 
-### Original code:
+## Original code:
 
 Should you wish to see the original without having to mess with the compiler
 line, try:

2013/birken/README.md

@@ -51,7 +51,7 @@ If you wish to speed it up 200% you can use instead `-DZ=3750`. Doing this
 you might find the right value to your liking; use ctrl-c to terminate the
 program early.
 
-### Original code:
+## Original code:
 
 Should you wish to see the original without having to mess with the compiler
 line, try: