[BUG #7710] added dispose method
use qxWeb instead of q
[BUG #7710] create list element if necessary
[BUG #7710] renamed CSS classes
minor
added debugger method
renamed debugger to debug to avoid conflict
[BUG #7710] Fixed selection for right alignment
[BUG #7710] Added unit tests for the Tabs widget
[BUG #7710] refactored page switch