elemsNewUI.txt: updated the expected HTML elements with specified id,
for the new UI.
StudioWebDiag.groovy: improvements for the latest version of the new UI:
added waits for page-loading and login; updated the URL for the new UI
(which no longer needs username/password for HTTP authentication);
updated the expected status messages for the new UI (“Query took”);
cleaned up / reorganized the ‘#testName’ method; included a kludge (in
‘#testName’ & checkResponse) for the fact that the new UI currently
always returns ‘Connect to a datasource first’ when run via Selenium.