add integrate demo and move comments

Demos/Makefile

@@ -5,20 +5,9 @@ test:	all
 	python run_primes.py 20
 	python run_numeric_demo.py
 	python run_spam.py
+	python integrate_timing.py
 	cd callback; $(MAKE) test
 	cd embed; $(MAKE) test
-	#
-	# longer running
-	#python integrate_timing.py
-	# also  run
-	# python setup.py build_ext --inplace in
-	#  benchmarks to build benchmarks
-	# python setup.py build_ext --inplace in libraries then
-	# python -c 'import call_mymath;print(call_mymath.call_sinc(1))'
-	#
-	# embed and freeze are working for python2 but not python3
-	#
-	#
 clean:
 	@echo Cleaning Demos
 	@rm -f *.c *.o *.so *~ core