Bugid 43207 wmu modal refactor

WMU has been refactored with the following changes:
- YUI Panel has been replaced with standard Wikia modal implementation
- YUI DOM actions have been replaced with jQuery
- YAHOO object usage has been minimalized to one (only the YUI Slider is still being used)
- Some methods and lines of code have been removed because it was not being used.

As for the YUI slider issue, we decided to make it into a project work after attempting to replace it with jquerytools rangeinput, and it ended up being a different product than it was.

The overall architecture remains mostly unchanged.