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/README.md

@@ -6,7 +6,7 @@ on how to compile the winner and how to run the winning program.
 Look at the winning source and try to figure how it does what it does!
 You may then wish to look at the Author's comments for even more details.
 
-The rules for 1986 suggested categories due to the success of the 1985
+The [rules for 1986](rules.txt) suggested categories due to the success of the 1985
 judging method.  The maximum size was increased from 512 to 1024 bytes.
 Larry Bassel joined as the second official judge.