git-timegraph

git_timegraph_writer.py now finally working symlinks. FIXED the error if writing symlink exists. Fully working

git_timegraph_writer.py has print verbose,dry run support and working symlinks. error if writing symlink is tried twice on two different runs in the same checkout dir

git_timegraph.py: symlink target uses mode 120000 to detect symlinks better than heuristics

remake git-diff-tree with --raw and reparse. symlink_target was never populated

try to preserve symlinks