Get all 1986 entries to compile

1986/wall will not compile under the default gcc (as it's actually
clang) with macOS as it requires -traditional-cpp which unfortunately
clang does not support.

Also fixed many of the README.md files.

Removed 1986/bright/bright.orig.c (probably because it won't compile on
modern systems but maybe not; I did that change a while back but didn't
finish working on 1986 until just now).

1986/stein/README.md

@@ -6,16 +6,20 @@ Jan Stein
 
         make all
 
-Judges' comments:
 
-> NOTE: to avoid problems with news and mail, the single line was split
-> into 3 lines.  Join all lines into a single line to recreate
-> the original file.
+## Judges' comments:
+
+NOTE: to avoid problems with news and mail, the single line was split
+into 3 lines.  Join all lines into a single line to recreate
+the original file.
+
 
 Try the program with the following argument:
 
+
 	./stein ^N^N
 
+
 (^N is ASCII control-N).  One some machines, ^M^L is needed to get it to
 output cleanly.  Your system may require another set of characters.
 In time, you will figure out what it does. :-)