Removing packages from archive-contents if removed from elpa-packages

[Philip Kaludercic]

Hi,

there is at least one broken package on NonGNU ELPA
(color-theme-tangotango) that was added, then removed as dependencies
were missing, but it remained in the archive because it was added to the
archive-contents file.  The following patch would make sure that any
package not listed in elpa-packages is also remove from
archive-contents:

0001-Remove-packages-from-archive-if-they-are-not-listed-.patch
Description: Text Data

It might be a good idea to cache the interpretation of elpa-packages, so
I would also suggest the following:

0001-Cache-elpaa-get-specs-invocations.patch
Description: Text Data

While this would fix the above problem, two points remain:

1. This does not remove any tarballs.  It wouldn't be hard to do, but I
   am not sure if there would be any unintended side effects of doing
   so -- at least immediately.

2. There are functioning packages on NonGNU ELPA like haskell-mode that
   were also added to elpa-packages then removed, and still linger in
   the archive without being updated.  This would get rid of those too,
   which might not be a good idea.