1989/fubar updates

Format fix the README.md file including removing some '\'s at end of
lines (in the remarks).

Document feature that if the arg is a large number or < 0 (the latter of
which I discovered a few minutes ago as I was working on this) it will
enter an infinite loop trying to compile code that has syntax errors.
This was noted by the judges at the time so it is not a bug but a
feature. This has been added to the bugs.md and the README.md file.

bugs.md

@@ -558,6 +558,15 @@ so, the program drops a core file into the directory.
 
 # 1989
 
+
+## [1989/fubar](1989/fubar/fubar.c) ([README.md](1989/fubar/README.md))
+## STATUS: INABIAF - please **DO NOT** fix
+
+Specifying too large a number (or < 0) to either `fubar` or the source code file
+(it's executable) that it generates will cause the program to enter an infinite
+loop, trying to compile code with syntax errors. At least in one system any
+number larger than 20 did this.
+
 ## [1989/robison](1989/robison/robison.c) ([README.md](1989/robison/README.md))
 ## STATUS: INABIAF - please **DO NOT** fix