Add col command

col is used to display troff documents in ttys, removing the reverse
line feeds generated by .2C in ms. This implementation keeps the limit
of 256 lines of 800 characteres of the original implementation.

Makefile

@@ -82,6 +82,7 @@ BIN =\
 	cksum\
 	cmp\
 	cols\
+	col\
 	comm\
 	cp\
 	cron\