* Try "/opt/local/bin/git" on OSX, since it's a common path for git, and
when running through the Finder it will usually not be found in the
$PATH.
* Explain the various results in a detailed comment.
Usually, the "%h" format should result in an abbreviated sha1, but it
looks like getting it through `git archive' returns the full thing
rather than the truncated version. So avoid the substring for now, and
find out if it's a git bug or not.
Some mentions of svn/subversion are replaced with git, and some patterns
for paths to ignore include ".git*". (Note ".mailmap" not added, might
need to.)
