Correctly remember collapsed sections (#608)
Correctly remember collapsed sections (#608)

Now the "collapsed" cookie stores which sections have changed state instead of which are collapsed.
Fuuzetsu/haddock,Fuuzetsu/haddock,Fuuzetsu/haddock,haskell/haddock,haskell/haddock,haskell/haddock,haskell/haddock,haskell/haddock,Fuuzetsu/haddock