automatically call 'make purge' before calling 'make package-update' or 'make package-overwrite'

src/Makefile

@@ -364,12 +364,12 @@ package-status ps:
 	@echo ''
 	@for p in $(PACKUSERUC); do $(SHELL) Package.sh $$p status; done
 
-package-update pu:
+package-update pu: purge
 	@for p in $(PACKAGEUC); do $(SHELL) Package.sh $$p update; done
 	@echo ''
 	@for p in $(PACKUSERUC); do $(SHELL) Package.sh $$p update; done
 
-package-overwrite:
+package-overwrite: purge
 	@for p in $(PACKAGEUC); do $(SHELL) Package.sh $$p overwrite; done
 	@echo ''
 	@for p in $(PACKUSERUC); do $(SHELL) Package.sh $$p overwrite; done