GIT v0.99.4

Thanks a lot to everybody who sent in usability enhancements and
bugfixes.

Updates since v0.99.3:

 - HTTP transport can pull from a packed repository.
 - RPM and Debian packages are hopefully usable out of the box.
 - Read-only operations on read-only repository should work better.
 - Commit and tag takes the message from the command line with -m.
 - Shortlog does not show things in reverse anymore.
 - Many commands now natively know SHA1 expressions (e.g. HEAD^^2).
 - Push can update remote refs that have different names from local.
 - Comes with the latest gitk.
 - A new command "git revert"
 - A bulk e-mailer (not installed by default).
 - Hopefully less leaky and less buggy.
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