UIMA-4035 DUCC Web Server (WS) remove extraneous <> from Performance tab display

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1628787 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4018 DUCC Web Server (WS) javascript

skip ajax call if previous one has not yet completed, and log this fact to console

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1628797 13f79535-47bb-0310-9956-ffa450edef68