All links in pager have 'active' class

This is due to the fact that the l() function adds 'active' to each URL that matches $_GET['q'], and ignores the differentiation of the 'query' arg.

The attached patch works around this active check by forcing an "external" fully qualified URL into l(), so it cannot determine that it's the active page. Multistep already contains the code to properly add an 'active' class to the really active step (as you can see by the fact the link gets two active classes assigned)