[GSoC 2010] The 10th official week

Hi,

    A short update of the line level history browser project.
1. The new parent pruning way is implemented and now the tool can
provide very good simplified history for a given range.
2. --full-line-diff get implemented in a new way. That's no interwind
bewteen --graph and --full-line-diff. (The origin behavior is that
--graph will override --full-line-diff), so you can run
--full-line-diff with or without --graph now. :)

    I will provide a rebased v4 patch series to the list. And the code
move/copy detect feature is under plan, it will get implemented next
week. :)