- fix the 46 errors reported by the w3c html validator in appview.php?versionid=whatever
- fix the 97 errors reported by the w3c html validator in index.php
- fix some code errors and typos (missing $ in front of variable names
and so on)
- fixed a lot of warnings that would have been thrown when error_reporting
is set to show notices (if(isset($variable))) instead of if($variable) for
example)