git merge --abort

Hi,

 I hope you don't mind me generating lots of noise here..

  It's not obvious how to abort a merge between two trees.  Would
aliasing  "git merge --abort"  to "git reset --hard"  be sensible?  Is
there a better way to abort a merge?  Especially if you have
uncommitted changes.

  If that idea isn't liked, instead maybe we can add a note to 'git
merge --help' on how to abort.

John