Partial fix for issue #321, to help reinitialize to previously viewed refseq. 
( was using this instead of thisB, and trying to assign refseq name string to refseq instead of full refseq object)
Partial fix for issue #321, to help reinitialize to last location on viewed refseq.
( reachedMilestone wasn't working, was looking for a deferred.fired property that never gets set. so reachedMilestone always returned false, and this was causing Browser._updateLocationCookies() to sometimes not get called)