qgit: added "Renames following" in annotation

I've just pushed (git://git.kernel.org/pub/scm/qgit/qgit4.git) a patch
series that add "renames following" to file annotation in qgit
preserving the non-linear (graph) history.

The most interesting cases in git tree are:

builtin-fsck.c (multiple renames)

builtin-mailinfo.c (multiple renames and changed directory)

git-clone.sh (nice history graph)

but the coolest is by far builtin-tar-tree.c where the file has been
renamed from tar- tree.c to builtin-tar-tree.c in _two_ different
commits on _two_ different branches then merged togheter in commit
1af0d11283...

To handle the latest one, a cool generalization has been necessary.

I have tested with _all_ the git files, and it seems to work in all the cases.

Have fun
Marco