Update to v1.4.0 - Performance monitoring nodes

Following a request via the forums for a means of timing node execution, the Vernalis plugin has now been updated with our performance monitoring nodes.  For more details, see https://tech.knime.org/book/vernalis-cheminformatics-nodes#testing

At present, the nodes only allow for standard data table inputs/outputs, or flow variables via the hidden node 'ears'.  If you find the nodes useful, and would like alternative ports (e.g database connection, image etc), then please let us know.