Updating jquery, jquery ui, and associated theme.

This also adds selectable to jquery ui.
Making multiple elements selectable.

Multiple elements can now be selected with the jquery "lasso" or by
holding control when clicking. To sort the elements there is now a
handle to the left that can be used to drag them.
Drag handle now appears on mouseover.
Changing tolerance on sortable handles to "pointer".

This makes sorting the list much easier.
Fixing sorable placeholder forcing list down.