Add various make targets for auditing the Python and JS modules. Update the install-node target so that it de-dupes JS modules.

Original patch by Aditya, with further work from Ashesh and I.

Makefile

@@ -20,7 +20,12 @@ appbundle: docs
 	./pkg/mac/build.sh
 
 install-node:
-	cd web && yarn install
+	cd web && npm install
+	cd web && npm audit fix
+	rm -f web/yarn.lock
+	cd web && yarn import
+	cd web && yarn audit
+	rm -f package-lock.json
 
 bundle:
 	cd web && yarn run bundle
@@ -34,6 +39,18 @@ linter:
 check: install-node bundle linter check-pep8
 	cd web && yarn run karma start --single-run && python regression/runtests.py
 
+check-audit:
+	cd web && yarn run audit
+
+check-auditjs:
+	cd web && yarn run auditjs
+
+check-auditjs-html:
+	cd web && yarn run auditjs-html
+
+check-auditpy:
+	cd web && yarn run auditpy
+
 check-pep8:
 	pycodestyle --config=.pycodestyle docs/
 	pycodestyle --config=.pycodestyle pkg/