Changelog message for updating packages

[Boruch Baum <boruch_baum@gmx.com>]

As an emacs user, I would like to know before updating a package what is
in store for me if I decide to perform an update. As a programmer, I
would like to inform / warn users of changes or new features when they
update. This has become a standard feature of linux package managers and
ought to become a feature of emacs' package.el IMO. For example, in
debian one can perform 'apt changelog foo' prior to upgrading package
foo, and a developer can prepare an update message that appears after an
upgrade (and is also mailed to the admin's mailbox).

Participating packages would need to have some standardized changelog
file and possible message file, and package.el would need one extra
interactive function and a handler for the possible messages.

If this has been discussed before, it's not my intention to re-hash a
previously rejected proposal.

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