Fixed an issue with scrollbars on fixed header tables

OK this may be only happening to me.
With a fixed header and pagination, if i navigate to a page where there is more content, the table scrolls, so it has a scrollbar, which changes the sizes of the columns. But the fixed header doesn't change, so the columns fall out of alignment.
Better explained with a screenshot : http://testdam.correosolucion.com/github/scrollbar.png
So i added a little hack to applyTableStyling() that calculates the scrollbar's width and pads the header accordingly.
Result : http://testdam.correosolucion.com/github/scrollbar2.png