[0/5] Patch set for various things

Here are a bunch of patches which I made first against linus, that I've rebased against pasky because they're mostly more version-control-like.

 1: Add a parsing function to revision.h
 2: Add merge-base
 3: Add http-pull
 4: Add option to make a hardlinkable cache of extracted options
 5: Add commit id to version info

This also served as a test of cleaning up a patch series with git; I took my current working directory, diffed it against its common ancestor with pasky (no longer current), split the patch into logical pieces, and applied them in sequence against the current pasky, committing after each one. This gives a history as if I'd actually written the code just like I would have had I known what I was doing in advance and done it very quickly this morning. I think this should work in the future as a way to avoid having the global revision control keeping developers' local mistakes while keeping history the way the mainline saw the development.

A thought for future work: it would be nice if I could identify commits that were used in creating a commit, but which should not be tracked down unless you were unfortunate enough to have been exposed to them (in which case you'd like know to deal with them).

	-Daniel
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