Some makefile cleanups

Conflicts:
	lib/java/Makefile

lib/Makefile

+.PHONY: all
 all:
 	cd c ; make
 	cd csharp ; make
 	cd java ; make
 
+.PHONY: test
 test:
 	$(MAKE) -C c test
 
+.PHONY: clean
 clean:
-	cd c ; make clean
-	cd csharp ; make clean
-	cd java ; make clean
+	$(MAKE) -C c clean
+	$(MAKE) -C csharp clean
+	$(MAKE) -C java clean
 	$(MAKE) -C python clean
 
+.PHONY: distclean
 distclean:
-	cd c ; make distclean
-	cd csharp ; make clean
-	cd java ; make clean
-	$(MAKE) -C python clean
+	$(MAKE) -C c distclean
+	$(MAKE) -C csharp distclean
+	$(MAKE) -C java  distclean
+	$(MAKE) -C python distclean

lib/csharp/Makefile

@@ -16,4 +16,6 @@ labcomm.dll: $(MODULES:%=se/lth/control/labcomm/%.cs) Makefile
 	mcs -out:$@ -target:library $(filter %.cs, $^)
 
 clean:
+
+distclean:
 	rm -f labcomm.dll

lib/python/Makefile

+.PHONY: clean
 clean:
 	find . -name '*.pyc' -exec rm {} \;
 
-distclean:
-	find . -name '*.pyc' -exec rm {} \;
+.PHONY: distclean
+distclean: clean