Patch-to-mail notes resurrected

Hi,

As some might remember, I made a script that writes notes (as in git-notes) linking patches to emails back in 2009:

  http://thread.gmane.org/gmane.comp.version-control.git/109074

I resurrected this idea the other week, using a faster implementation (the N command in fast-import is great!) and generating better links. I am regularly pushing the results to

  git://github.com/trast/git.git
  git://repo.or.cz/git/trast.git

branches

  notes/gmane        a link to the gmane thread view, focused on this patch
  notes/message-id   the raw message-id

Point your notes.displayRef at one or both to use them.

It still fails to match some commits, so consider this WIP, but I think it's quite useful already.