Disable Hydra builds for all "old" Haskell packages.

Old means that we have a newer version in Nixpkgs already. If there is a reason
for the old package to still exist, i.e. because some other package is still
referring to it, then Hydra will still build the package as a dependency, but
we won't want to build old packages on their own right.
Remove 'andres' from the meta.maintainer section of all Haskell package where I
had added him earlier.