Release tasks using release-specific virtual environments

Refine the development process and define the procedure for
releasing new versions.

Makefile

@@ -3,11 +3,31 @@ PYP_DIR = src/py
 
 .PHONY: install
 .PHONY: run_tests
+.PHONY: release
+.PHONY: deploy
 
+
+# Generate and install developmet versions of the extension
+# and python package.
+# The extension is named 'dev' with a 'current' alias for easily upgrading.
+# The Python package is installed in a virtual environment envs/dev/
+# Requires sudo.
 install:
 	$(MAKE) -C $(PYP_DIR) install
 	$(MAKE) -C $(EXT_DIR) install
 
-testinstalled:
-	$(MAKE) -C $(PYP_DIR) testinstalled
-	$(MAKE) -C $(EXT_DIR) installcheck
+# Run the tests for the installed development extension and
+# python package
+test:
+	$(MAKE) -C $(PYP_DIR) test
+	$(MAKE) -C $(EXT_DIR) test
+
+# Generate a new release into release
+release:
+	$(MAKE) -C $(EXT_DIR) release
+
+# Install the current release.
+# The Python package is installed in a virtual environment envs/X.Y.Z/
+# Requires sudo.
+deploy:
+	$(MAKE) -C $(EXT_DIR) deploy