dev-vcs/git-annex: bump up to 3.20130107

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-vcs/darcs-fastconvert: removed as requires darcs-2.5 and nobody wants to fix it

If you plan to restore it - do it right in darcs upstream.
Darcs ought to have minimal import/export functionality
if it calls itself a modern VCS.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>