When going through the filter list for an item, we download and store the item
everytime a filter is matched.
This patch allowes an item to be downloaded the first time a filter
match and save the data throughout the rest of the list, so all
other matches never downloads the item again but uses the data in memory.
Better to have an destination for every filter then every target.
otherwise one will have to have two targets with the same source but
different destination.
