XML parser introduced, ext-surfbar rewritten, more EL code:

XML parser introduced, ext-surfbar rewritten, more EL code:
- XML parser functions (see xml-functions.php) introduced which shall make it
  much easier in adding list/edit/delete/foo forms to the script by a XML
  rather than tons of hard-to-debug code or large call parameters
- Extension ext-surfbar: Edit/delete/lock/unlock/undelete of URLs is now
  rewritten to make usage of above XML parser
- For same extension, new translateFooToBar() wrappers has been introduced in
  EL code.
- TODOs.txt updated