offlineimap: enable support for the sqlite status backend
xxdiff: update to current HEAD of the source repository
Merge pull request #477 from coroa/offlineimap

offlineimap: enable support for the sqlite status backend
Revert "experimental/shadow"

This reverts commit 788e760b515f29c349acd526d23e1a99b6d67fde.  NixOS
doesn't even have an /etc/skel.  And if we had, 1) NixOS has the
ability to create regular files rather than symlinks in /etc
(environment.etc.<file>.mode = ...), so files in /etc/skel that should
be copied as regular files can be supported; and 2) we may actually
*want* to copy a symlink.

Also, typos in file names.  Bleh.
curl: Update to 7.30.0

CVE-2013-1944
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