Showing download confirmation window.
Refactor.
Confirmation window delegates to active record store.
Now submitting download request via a form (so that download returns as a file).
Remove commented out code.
Introduced 'downloadableLinks' property, which is the one used for display and to determine what is to be downloaded.
It's now possible to remove a layer from the map and have it removed from the download cart.
Fixed up conflict/merge error.