Enhance the test coverage rule in src/Makefile (print the ratio

dead hits versus all hits).

src/Makefile

@@ -70,15 +70,19 @@ test/ocamlprof.dump: pbc test
 prof: test/ocamlprof.dump
 	mkdir prof || rm prof/*
 	for d in ${SOURCES}; do \
-	   ocamlprof -f test/ocamlprof.dump $$d > prof/$$d ;\
+	   ocamlprof -F "ocamlprof: " -f test/ocamlprof.dump $$d > prof/$$d ;\
 	done
 
 grep:
 	rm test/ocamlprof.dump || true
 	make clean
 	make prof
-	grep -n -e  "(\* 0 \*)" prof/*.ml | grep -v "assert false" > dead.grep
-	wc dead.grep > untested_line_counter
+	grep -n -e  "(\* ocamlprof: 0 \*)" prof/*.ml | grep -v "assert false" > dead.grep
+	grep -n -e  "(\* ocamlprof: " prof/*.ml | grep -v "assert false" > all.grep
+	DEAD_HITS=`wc -l dead.grep | cut -f 1 -d " "`;\
+	ALL_HITS=`wc -l all.grep  | cut -f 1 -d " "`;\
+	SOL=`echo "scale=2 ; $$DEAD_HITS * 100 / $$ALL_HITS " | bc ` ;\
+	echo "$$DEAD_HITS / $$ALL_HITS = $$SOL %" > untested_line_counter
 	cat untested_line_counter
 
 ##############################################################################"

src/untested_line_counter

-  402  4118 32317 dead.grep
+402 / 1584 = 25.37 %