Moved code coverage configuration into .coveragerc file.

.coveragerc

+[run]
+branch = true
+omit =
+    /usr/share/pyshared/*
+    test.py
+    tests/*
+
+[html]
+directory = coverage

Makefile

 TEST := test.py
 COVERAGE_DIR := coverage
-COVERAGE_OMIT=/usr/share/pyshared/*,test.py,tests/*
 
 test:
 	@pyrg $(TEST)
 
-coverage:
-	coverage erase
-	@if [ -d $(COVERAGE_DIR) ]; then rm -rf $(COVERAGE_DIR)/* \
-	else mkdir $(COVERAGE_DIR); fi
+coverage: covclean
 	coverage run test.py
-	coverage html --omit=$(COVERAGE_OMIT) -d $(COVERAGE_DIR)
-	coverage report --omit=$(COVERAGE_OMIT)
+	coverage report
+	coverage html
 
-clean:
+covclean:
 	coverage erase
-	rm -rf $(COVERAGE_DIR) `find -name \*.pyc`
+	rm -rf $(COVERAGE_DIR)
+
+clean: covclean
+	rm `find -name \*.pyc`
 
-.PHONY: test clean coverage
+.PHONY: test clean coverage covclean