Implement release with variant python package names

Instead of having to use different virtual environments for development
and for each version to be used in development here we're using
differnt names for each release's python package.
There a pending problem here: pip replaces underscores in the package name
by dashes when installing it.

Makefile

@@ -8,6 +8,12 @@ install:
 	$(MAKE) -C $(PYP_DIR) install
 	$(MAKE) -C $(EXT_DIR) install
 
-testinstalled:
-	$(MAKE) -C $(PYP_DIR) testinstalled
-	$(MAKE) -C $(EXT_DIR) installcheck
+test:
+	$(MAKE) -C $(PYP_DIR) test
+	$(MAKE) -C $(EXT_DIR) test
+
+release: install
+	$(MAKE) -C $(EXT_DIR) release
+
+deploy:
+	 echo 'not yet implemented'