[#7837] ticket:736 Add usefull diff-tree options
[#7837] ticket:736 Add usefull diff-tree options

- `--root` to show initial commit as a big creation event
- `-t` to show tree entry itself as well as subtrees.
  Commit.added_paths relies on this

lym/allura-git,apache/allura,heiths/allura,heiths/allura,apache/allura,apache/allura,lym/allura-git,heiths/allura,heiths/allura,lym/allura-git,lym/allura-git,apache/allura,lym/allura-git,heiths/allura,apache/allura