Major feature enhancements of web GUI
* Switch to jQuery DataTables
  * Search field and various
  * Export data as CSV, PDF, Clipboard
  * Scroll table area
  * Print view for table data
  * Preparation for AJAX loading of content
* Persist active tab in URL
* Scroll content area and not entire page (supports window resizing)
* Print view via CSS media
* Various layout improvements
* Enable debug mode only if LML_DEBUG is set AND contains a Perl true
  value. As a result LML_DEBUG=0 does NOT enable debugging