Fixes in guidelines and rules

The guidelines had many fixes and where necessary updates (about new
tools for instance) plus some fun for people to discover.

The FAQ was slightly updated as well for the guidelines.

Makefile

@@ -518,7 +518,7 @@ faq: ${GEN_TOP_HTML} faq.md
 	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
 	@echo "You have a question?"
 	${GEN_TOP_HTML} -v 1 faq
-	@echo "Perhaps the FAQ might help."
+	@echo "Perhaps the FAQ might help!"
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='