Comment 1 for bug 1190067

I've attached a branch that:

1) changes the list from comma-separated to newline-separated.

2) Merges the hierarchical list so only the longest ones are listed.

The patch from the branch was tested against version 0.9daily12.12.05-0ubuntu1 (in Ubuntu 13.04) but it should work fine as the shotwell scope looks virtually unchanged since.