Emacs Lisp API for updating package.el packages

[Bozhidar Batsov]

Hi guys,

As far as I know the only way to update the install packages via package.el is the following:

* M-x package-list-packages

* U (mark packages that can be upgraded)

This works, but it's a bit limiting. For instance, someone might want to have Emacs check for package updates on startup and install them.

It'd be really great if there were a command `package-upgrade` that would upgrade a package if possible (and maybe a command `package-upgrade-all` that just wraps `package-upgrade`. 

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Cheers,

Bozhidar