Add alt code to 1989/paul + format README.md

The alt code is based on the author's remarks: a trace routine had been
provided but it was commented out. It offers for some rather fun output.
The Makefile was updated accordingly.

The README.md file has been typo and format fixed.

The .gitignore file has been updated - added paul.alt.

1989/paul/Makefile

@@ -114,8 +114,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################